#!/bin/python3

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 = input()
    matrix.append(matrix_item)
string=""
for i in range(m):
    for j in range(n):
        string+=(matrix[j][i])
i=0
string1=[]
stri=""
while (i<len(string) and not (string[i].isalnum())):
    stri+=string[i]
    i+=1
print(stri, end="")
flag=(len(stri)==len(string))
while (i<len(string)):
    stri=""
    while (i<len(string) and string[i].isalnum()):
        stri+=string[i]
        i+=1
    while (i<len(string) and not (string[i].isalnum())):
        i+=1
    string1.append(stri)
i=len(string)-1
stri=""
while (i>-1 and not (string[i].isalnum())):
    stri+=string[i]
    i-=1
print(" ".join(string1),end="")
while(not(flag)):
    print(stri[::-1])
    flag=True