import random as r
from collections import deque

def generate_random_matrix(N, M):
    """
    Генерирует матрицу N x M со случайными значениями 0, 1, 2
    """
    matrix = [[0] * M for _ in range(N)]
    
    for i in range(N):
        for j in range(M):
            matrix[i][j] = r.randint(0, 2)
    
    return matrix

def count_good_apples(matrix):
    count = 0
    for row in matrix:
        count += row.count(1)
    return count

def solve_minutes(matrix):
    if not matrix or not matrix[0]:
        return -1
    
    N = len(matrix)
    M = len(matrix[0])
    queue = deque()
    good_count = 0
    
    matrix_copy = [row[:] for row in matrix]
    
    for i in range(N):
        for j in range(M):
            if matrix_copy[i][j] == 2:
                queue.append((i, j, 0))
            elif matrix_copy[i][j] == 1:
                good_count += 1
    

    if good_count == 0:
        return 0
    
    directions = [(-1, 0), (1, 0), (0, -1), (0, 1)]
    
    minutes = 0
    
    while queue:
        i, j, time = queue.popleft()
        minutes = max(minutes, time)
        
        for di, dj in directions:
            ni, nj = i + di, j + dj
            if 0 <= ni < N and 0 <= nj < M and matrix_copy[ni][nj] == 1:
                matrix_copy[ni][nj] = 2
                good_count -= 1
                queue.append((ni, nj, time + 1))
    
    return minutes if good_count == 0 else -1

def print_matrix(matrix):

    for row in matrix:
        print("\t".join(map(str, row)))

def main():
    print("Миграция червяков по яблокам")
    
    N = int(input("\nВведите количество строк N: "))
    M = int(input("Введите количество столбцов M: "))
    
    matrix = generate_random_matrix(N, M)
    
    print("\nСгенерированная матрица:")
    print_matrix(matrix)
    
    good_before = count_good_apples(matrix)
    print(f"Количество хороших яблок изначально: {good_before}")
    
    result = solve_minutes(matrix)
    
    if result == -1:
        print("\nРезультат: -1 (червяки не научились летать)")
    else:
        print(f"\nРезультат: {result} минут")

if __name__ == "__main__":
    main()