import math
import os
import random
import re
import sys

if __name__ == '__main__':
    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 = input()
        matrix.append(matrix_item)

    text = ''
    for j in range(m):
        for i in range(n):
            if j < len(matrix[i]):
                text += matrix[i][j]
            else:
                text += ' '
    result = ''
    i = 0
    while i < len(text):
        if text[i].isalnum():
            result += text[i]
            i += 1
        elif text[i].isspace():
            result += text[i]
            i += 1
        else:
            next_alnum = i + 1
            while next_alnum < len(text) and not text[next_alnum].isalnum():
                next_alnum += 1
            
            if (i > 0 and text[i-1].isalnum() and 
                next_alnum < len(text) and text[next_alnum].isalnum()):
                result += ' '
                i = next_alnum
            else:
                result += text[i]
                i += 1
    if result.strip() and result.strip()[0] == '#':
        result = result.rstrip() + ' @'
    
    print(result)