diff --git a/2017/12/12.md b/2017/12/12.md
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--- /dev/null
+++ b/2017/12/12.md
@@ -0,0 +1,80 @@
+## \-\-- Day 12: Digital Plumber \-\--
+
+Walking along the memory banks of the stream, you find a small village
+that is experiencing a little confusion: some programs can\'t
+communicate with each other.
+
+Programs in this village communicate using a fixed system of *pipes*.
+Messages are passed between programs using these pipes, but most
+programs aren\'t connected to each other directly. Instead, programs
+pass messages between each other until the message reaches the intended
+recipient.
+
+For some reason, though, some of these messages aren\'t ever reaching
+their intended recipient, and the programs suspect that some
+pipes
+are missing. They would like you to investigate.
+
+You walk through the village and record the ID of each program and the
+IDs with which it can communicate directly (your puzzle input). Each
+program has one or more programs with which it can communicate, and
+these pipes are bidirectional; if `8` says it can communicate with `11`,
+then `11` will say it can communicate with `8`.
+
+You need to figure out how many programs are in the group that contains
+program ID `0`.
+
+For example, suppose you go door-to-door like a travelling salesman and
+record the following list:
+
+    0 <-> 2
+    1 <-> 1
+    2 <-> 0, 3, 4
+    3 <-> 2, 4
+    4 <-> 2, 3, 6
+    5 <-> 6
+    6 <-> 4, 5
+
+In this example, the following programs are in the group that contains
+program ID `0`:
+
+-   Program `0` by definition.
+-   Program `2`, directly connected to program `0`.
+-   Program `3` via program `2`.
+-   Program `4` via program `2`.
+-   Program `5` via programs `6`, then `4`, then `2`.
+-   Program `6` via programs `4`, then `2`.
+
+Therefore, a total of `6` programs are in this group; all but program
+`1`, which has a pipe that connects it to itself.
+
+*How many programs* are in the group that contains program ID `0`?
+
+Your puzzle answer was `113`.
+
+## \-\-- Part Two \-\-- {#part2}
+
+There are more programs than just the ones in the group containing
+program ID `0`. The rest of them have no way of reaching that group, and
+still might have no way of reaching each other.
+
+A *group* is a collection of programs that can all communicate via pipes
+either directly or indirectly. The programs you identified just a moment
+ago are all part of the same group. Now, they would like you to
+determine the total number of groups.
+
+In the example above, there were `2` groups: one consisting of programs
+`0,2,3,4,5,6`, and the other consisting solely of program `1`.
+
+*How many groups are there* in total?
+
+Your puzzle answer was `202`.
+
+Both parts of this puzzle are complete! They provide two gold stars:
+\*\*
+
+At this point, you should [return to your Advent calendar](/2017) and
+try another puzzle.
+
+If you still want to see it, you can [get your puzzle
+input](12/input).
diff --git a/2017/12/solution.py b/2017/12/solution.py
new file mode 100644
index 0000000..2aa43e9
--- /dev/null
+++ b/2017/12/solution.py
@@ -0,0 +1,101 @@
+#!/bin/python3
+import sys,re
+from pprint import pprint
+sys.path.insert(0, '../../')
+from fred import list2int
+
+input_f = 'input'
+
+part = 2
+#########################################
+#                                       #
+#              Part 1                   #
+#                                       #
+#########################################
+
+def visit(next,visited,records):
+    #print('Starting at',next, ' having visited',visited)
+    #print(records[next])
+    if len(records[next]) == 1:
+        if records[next][0] not in visited:
+            visited.append(records[next][0])
+            next = records[next][0]
+            visit(next,visited,records)
+    else:
+        for i in records[next]:
+            if i not in visited:
+                visited.append(i)
+                visit(i,visited,records)
+    return visited
+
+if part == 1:
+
+    records = {}
+    visited = []
+
+    with open(input_f) as file:
+        for line in file:
+            l = line.rstrip().replace(' ','')
+            if '<->' in l:
+                x = l.split('<->')
+                records[int(x[0])] = list2int(x[1].split(','))
+                
+    #pprint(records)
+    start_node = 0
+
+    visited = visit(start_node,visited,records)
+                
+
+    print(visited)
+    print(len(visited))
+
+
+#########################################
+#                                       #
+#              Part 2                   #
+#                                       #
+#########################################
+def visit(next,visited,records):
+    #print('Starting at',next, ' having visited',visited)
+    #print(records[next])
+    if len(records[next]) == 1:
+        if records[next][0] not in visited:
+            visited.append(records[next][0])
+            next = records[next][0]
+            visit(next,visited,records)
+    else:
+        for i in records[next]:
+            if i not in visited:
+                visited.append(i)
+                visit(i,visited,records)
+    return visited
+
+if part == 2:
+
+    records = {}
+    visited = []
+
+    with open(input_f) as file:
+        for line in file:
+            l = line.rstrip().replace(' ','')
+            if '<->' in l:
+                x = l.split('<->')
+                records[int(x[0])] = list2int(x[1].split(','))
+                
+    #pprint(records)
+    start_node = 0
+
+    groups = []
+
+    for i in range(0,len(records)):
+        if not any(i in sublist for sublist in groups):
+            #print(i, ' not in ', groups)
+            visited = visit(i,visited,records)
+            groups.append(visited)
+            #print('Visited',visited)
+            visited = []
+            #print(len(visited))
+        
+    pprint(groups)
+    print(len(groups))
+
diff --git a/__pycache__/fred.cpython-311.pyc b/__pycache__/fred.cpython-311.pyc
new file mode 100644
index 0000000..3fb6e16
Binary files /dev/null and b/__pycache__/fred.cpython-311.pyc differ
diff --git a/fred.py b/fred.py
new file mode 100644
index 0000000..1ca6baa
--- /dev/null
+++ b/fred.py
@@ -0,0 +1,2 @@
+def list2int(x):
+    return list(map(int, x))
diff --git a/solution.py b/solution.py
index 3814efb..beabd72 100644
--- a/solution.py
+++ b/solution.py
@@ -11,9 +11,9 @@ part = 1
 #                                       #
 #########################################
 
-if part == 1
-with open(input_f) as file:
-    for line in file:
+if part == 1:
+    with open(input_f) as file:
+        for line in file: