import sys
from collections import defaultdict
map = [list(x.strip()) for x in sys.stdin]

print(map)

Y = len(map)
X = len(map[0])
assert all(len(row) == X for row in map)

N,E,S,W = 1,2,4,8
unknown = 0b11111
grid = {}
start = None
for i, row in enumerate(map):
    for j,c in enumerate(row):
        d = 0
        if c == ".": d = 0
        elif c == "7": d = W|S
        elif c == "J": d = N|W
        elif c == "L": d = N|E
        elif c == "F": d = S|E
        elif c == "|": d = N|S
        elif c == "-": d = W|E
        elif c == "S":
            d = unknown
            start = (i,j)
        else:
            raise Exception("invalid char %s at (%s,%s)" % (c, i, j))
        grid[i,j] = d

print(grid)


def find_loop(grid, start):
    front = [(0,start)]
    dist = {}
    count = defaultdict(int)
    count[start] -= 1
    def push(i,j,from_):
        if grid.get((i,j),0)&from_:
            front.append((cost+1, (i,j)))
    while front:
        front.sort()
        cost, n = front.pop(0)
        if n not in grid:
            continue
        count[n] += 1
        if n in dist:
            continue
        dist[n] = cost
        i, j = n
        d = grid[n]
        if d&N: push(i-1,j,S)
        if d&S: push(i+1,j,N)
        if d&W: push(i,j-1,E)
        if d&E: push(i,j+1,W)

    #print(count.values())
    if not all(c == 2 for c in count.values()):
        # not a loop
        return {}

    return dist
            
for D in [W|S, N|W, N|E, S|E, N|S, W|E]:
    grid[start] = D
    loop = find_loop(grid, start)
    if loop:
        print(D, loop)
        print(max(loop.values()))