#!/bin/python3

import math
import os
import random
import re
import sys



if __name__ == '__main__':
    n,m = map(int,input().split())
    arr = []

    for _ in range(n):
        arr.append(list(map(int, input().rstrip().split())))

    k = int(input())
    for info in sorted(arr,key = lambda x : x[k]):
        print(*info)