if __name__ == '__main__':
    nm = input().split()
    n = int(nm[0])
    m = int(nm[1])
    arr = []
    for _ in range(n):
        arr.append(list(map(int, input().split())))
    k = int(input())
    arr = sorted(arr, key = lambda x: x[k])
    for x in arr:
        print(' '.join(map(str, x)))