import sys
import random

def input_matrix(file=sys.stdin):
    n, m = map(int, file.readline().split())
    matrix = [list(map(float, file.readline().split())) for _ in range(n)]
    assert all(len(row) == m for row in matrix), "row length != m"
    return matrix

def print_matrix(matrix, file=sys.stdout):
    n, m = len(matrix), len(matrix[0])
    assert all(len(row) == m for row in matrix), "inconsistent row length"
    print(n, m, file=file)
    for row in matrix:
        print(*row, file=file)

with open("matrix.txt", "w") as file:
    matrix = [[random.randrange(10) for _ in range(3)] for _ in range(5)]
    print_matrix(matrix, file=file) # вывод в файл

with open("matrix.txt", "r") as file:
    matrix = input_matrix(file=file) # чтение из файла
    print_matrix(matrix) # вывод на экран