#!/usr/bin/env python3
# -*- coding: utf-8 -*-

part_sum = 0
matrix = []

# read matrix like day 3
input_file = open("input", "r")
for line in input_file:
    matrix.append(line.strip())
input_file.close()

zeilen = len(matrix)
spalten = len(matrix[0])

# Ausgabe Matrix und Startposition finden
for i in range(len(matrix)):
    if "S" in matrix[i]:
        zs = i
    print(matrix[i])
for j in range(len(matrix[zs])):
    if "S" in matrix[zs][j]:
        ss = j
print()
print(f"Startposition: {zs}, {ss}")


def where_to_go(z, s, prev):
    try:
        if [z, s] != prev and (matrix[z-1][s] == "F" or matrix[z-1][s] == "7" or matrix[z-1][s] == "|"):
            return z-1, s
    except IndexError:
        pass
    try:
        if [z, s] != prev and (matrix[z+1][s] == "L" or matrix[z+1][s] == "J" or matrix[z-1][s] == "|"):
            return z+1, s
    except IndexError:
        pass
    try:
        if [z, s] != prev and (matrix[z][s+1] == "J" or matrix[z][s+1] == "7"):
            return z, s+1
    except IndexError:
        pass
    try:
        if [z, s] != prev and (matrix[z][s-1] == "F" or matrix[z][s-1] == "L"):
            return z, s-1
    except IndexError:
        pass

print(where_to_go(1,1,[]))