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    import math import os import random import re import sys

    first_multiple_input = input().rstrip().split()

    n = int(first_multiple_input[0])

    m = int(first_multiple_input[1])

    matrix = []

    for _ in range(n): matrix_item = [char for char in input()] matrix.append(matrix_item) zipped_list = list(zip(*matrix)) for i in range(m): zipped_list[i] = "".join(zipped_list[i]) decodedMsg = "".join(zipped_list)

    matches = re.sub(r'(?<=\w)[^\w]+(?=\w)',' ', decodedMsg) print(matches)