#!/bin/python3

import math
import os
import random
import re
import sys

if __name__ == '__main__':
    # Read the first line: number of rows (n) and number of columns (m)
    nm = input().split()

    n = int(nm[0])  # Number of athletes
    m = int(nm[1])  # Number of attributes per athlete

    arr = []

    # Read the next n lines containing athlete details
    for _ in range(n):
        arr.append(list(map(int, input().rstrip().split())))

    # Read the sorting column (k), indexed from 0
    k = int(input())

    # Sort the array based on the k-th attribute using a lambda function
    arr.sort(key=lambda x: x[k])

    # Print the sorted array
    for row in arr:
        print(" ".join(map(str, row)))