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().rstrip().split())))

    k = int(input())

    arr = sorted(arr, key=lambda x: x[k])
    
    for i in arr:
        print(' '.join(str(item) for item in i))