import random


def create_file():
    n = random.randint(5, 10)
    maze = []
    for _ in range(n):
        row = "".join(["M" if random.random() < 0.3 else " " for _ in range(n)])
        maze.append(row)
    with open("maze.txt", "w") as f:
        for row in maze:
            f.write(row + "\n")
    return n


def read_maze():
    with open("maze.txt") as f:
        maze = [list(line.rstrip("\n")) for line in f]
    return maze


def solve(maze, x, y, xc, yc, visited, length, best):
    n = len(maze)
    if x < 0 or y < 0 or x >= n or y >= n:
        return
    if maze[x][y] == "M" or visited[x][y]:
        return
    if length >= best[0]:
        return
    if x == xc and y == yc:
        best[0] = min(best[0], length)
        return
    visited[x][y] = True
    solve(maze, x + 1, y, xc, yc, visited, length + 1, best)
    solve(maze, x - 1, y, xc, yc, visited, length + 1, best)
    solve(maze, x, y + 1, xc, yc, visited, length + 1, best)
    solve(maze, x, y - 1, xc, yc, visited, length + 1, best)
    visited[x][y] = False


while True:
    print("\n1 - создать лабиринт\n2 - решить\n0 - выход")
    try:
        c = input("Выбор: ")
        if c == "1":
            n = create_file()
            print("Файл создан. Размер:", n)
        elif c == "2":
            maze = read_maze()
            n = len(maze)
            x = int(input("Старт X: "))
            y = int(input("Старт Y: "))
            xc = int(input("Сыр X: "))
            yc = int(input("Сыр Y: "))
            visited = [[False] * n for _ in range(n)]
            best = [10**9]
            solve(maze, x, y, xc, yc, visited, 0, best)
            if best[0] == 10**9:
                print("Путь не найден")
            else:
                print("Кратчайший путь:", best[0])
        elif c == "0":
            break
    except:
        print("Ошибка ввода")