import sys
from pprint import pprint

#colors
from termcolor import colored

grid = []

log = True

def p(x,steps):
    global log
    if log:
        for idx,i in enumerate(x):
            for jdx,j in enumerate(i):
                if j == 'S':
                    print(colored(j,'red'),end='')
                elif (idx,jdx) in steps:
                    print(colored(j,'green'),end='')
                else:
                    print(j,end='')
            print()


def start_coords(grid):
    for ydx,y in enumerate(grid):
        for xdx,x in enumerate(y):
            if x == 'S':
                return (xdx,ydx)

with open(sys.argv[1]) as file:
    for line in file:
        grid.append(line.rstrip())

for ldx,line in enumerate(grid):
    grid[ldx] = line.translate(str.maketrans("-|F7LJ.", "─│┌┐└┘ "))



steps = []

#p(grid,steps)

found = False

start = start_coords(grid)
cur = start
prev = cur
count = 0

def wall(loc):
    return grid[loc[1]][loc[0]]

"""
steps = [(3,3),(2,3),(4,3),(3,2),(3,4)]
tmps = []
for i in steps:
    tmps.append(i)
    p(grid,tmps)
    input()
exit()
"""
y = cur[0]
x = cur[1]
print('Right is ' + wall((y+1,x)) + grid[x][y+1],end='')
print((y+1,x))
print('Left is ' +  wall((y-1,x)) + grid[x][y-1],end='')
print((y-1,x))
print('Up is ' +    wall((y,x-1)) + grid[x-1][y],end='')
print((y,x-1))
print('Down is ' +  wall((y,x+1)) + grid[x+1][y],end='')
print((y,x+1))
print()
p(grid,steps)

while not found:
    y = cur[0]
    x = cur[1]

    sub_found = False
    print('Start: ' + str(cur) + ' ' + wall(cur))
   
    dirc = ''

    print('Trying to find way')
    print('Previous is ' + str(prev) + wall(prev))
    if y+1 < len(grid[0]) and not sub_found:
        # Right
        new = (list(cur)[0]+1,list(cur)[1])
        if grid[x][y+1] in ('─','┐','┘') and new != prev:
            print('Trying Right')
            print('prev: ' + str(prev) + ' cur: ' + str(cur) + ' new: ' + str(new))
            dirc = 'R'
            if wall(cur) in ('─','┌','└','S'):
                print('Went Right')
                prev = (y,x)
                y += 1
                sub_found = True
    else:
        print('Cant go right cus ' + str(y) + ' < ' + str(len(grid)))

    if y > 0 and not sub_found:
        # Left
        new = (list(cur)[0]-1,list(cur)[1])
        if grid[x][y-1] in ('─','┌','└') and new != prev:
            print('Trying Left')
            print('prev: ' + str(prev) + ' cur: ' + str(cur) + ' new: ' + str(new))
            dirc = 'L'
            if wall(cur) in ('─','┐','┘','S'): 
                print('Went Left')
                y -= 1
                sub_found = True
    else:
        print('Cant go left cus ' + str(y) + ' > ' + str(0))

    if x > 0 and not sub_found:
        # Up
        new = (list(cur)[0],list(cur)[1]-1)
        if grid[x-1][y] in ('│','┌','┐') and new != prev:
            print('Trying Up')
            print('prev: ' + str(prev) + ' cur: ' + str(cur) + ' new: ' + str(new))
            dirc = 'U'
            if wall(cur) in ('│','└','┘','S'): 
                print('Went Up')
                x -=1
                sub_found = True

    if x < len(grid) and not sub_found: 
        # Down
        new = (list(cur)[0],list(cur)[1]+1)
        if grid[x+1][y] in ('│','└','┘') and new != prev:
            print('Trying Down')
            print('prev: ' + str(prev) + ' cur: ' + str(cur) + ' new: ' + str(new))
            dirc = 'D'
            if wall(cur) in ('│','┌','┐','S'): 
                print('Went Down')
                x += 1
                sub_found = True
    
    
    cur = (y,x) 
    
    steps.append((x,y))
    print('Going ' + dirc + ' to ' + str(cur) + ' ' + wall(cur))
    print('Previous is ' + str(prev) + ' ' + wall(prev))
    p(grid,steps)
    print()
    input()
    count += 1
    if cur == start:
        found = True

print(count)