PBOXES = [[4, 0, 3, 2, 6, 8, 1, 13, 16, 7, 15, 12, 11, 9, 14, 10, 17, 5], [6, 13, 17, 8, 7, 11, 15, 5, 0, 10, 4, 16, 1, 3, 14, 12, 9, 2], [9, 17, 13, 11, 4, 10, 16, 8, 14, 7, 15, 1, 6, 5, 12, 3, 0, 2], [3, 14, 17, 5, 11, 2, 10, 12, 1, 16, 6, 9, 0, 4, 8, 15, 13, 7], [6, 9, 11, 16, 8, 10, 7, 14, 15, 12, 5, 1, 4, 0, 3, 17, 13, 2], [0, 13, 9, 6, 2, 15, 5, 11, 17, 14, 12, 16, 7, 3, 10, 4, 1, 8], [7, 0, 8, 13, 16, 1, 15, 17, 5, 14, 10, 3, 2, 12, 9, 4, 6, 11], [10, 4, 17, 7, 2, 1, 11, 13, 5, 6, 16, 8, 9, 0, 12, 3, 15, 14]]
SBOX = [74, 3, 10, 192, 95, 220, 206, 247, 200, 66, 139, 64, 39, 5, 62, 207, 63, 81, 120, 30, 55, 121, 219, 107, 45, 156, 237, 211, 190, 125, 35, 162, 248, 216, 20, 26, 166, 80, 122, 37, 254, 177, 225, 14, 33, 76, 181, 227, 168, 51, 161, 218, 41, 18, 209, 71, 236, 25, 150, 241, 228, 119, 97, 85, 129, 194, 130, 195, 210, 123, 22, 102, 65, 203, 193, 128, 132, 144, 253, 134, 124, 48, 141, 54, 60, 224, 226, 246, 19, 148, 29, 91, 173, 243, 244, 88, 208, 7, 198, 103, 217, 43, 199, 24, 58, 160, 221, 151, 89, 214, 69, 82, 112, 115, 127, 155, 99, 180, 164, 172, 27, 109, 21, 185, 187, 145, 140, 96, 201, 137, 138, 0, 6, 142, 34, 251, 8, 72, 11, 75, 205, 70, 57, 174, 184, 204, 149, 163, 111, 59, 186, 79, 53, 42, 52, 110, 189, 104, 15, 196, 4, 188, 117, 36, 158, 197, 78, 61, 154, 242, 231, 223, 32, 17, 183, 56, 143, 233, 16, 169, 165, 245, 23, 101, 116, 38, 84, 135, 234, 133, 147, 46, 131, 67, 2, 136, 50, 167, 86, 118, 1, 9, 202, 73, 12, 191, 235, 153, 152, 238, 213, 222, 68, 28, 239, 93, 215, 176, 98, 126, 159, 13, 250, 94, 87, 113, 49, 31, 83, 232, 229, 108, 240, 170, 175, 100, 44, 230, 255, 114, 249, 40, 178, 47, 77, 252, 105, 179, 146, 182, 171, 157, 212, 106, 92, 90]
INIT = [248, 142, 163, 165, 248, 3, 71, 246, 9, 67, 203, 73, 195, 2, 192, 201, 203, 136]

BLOCKSIZE = 8

def blocks(x):
    return list(zip(*[iter(x)] * BLOCKSIZE))

def permute(s):
    res = [0 for _ in s]
    for b in range(8):
        for i, x in enumerate(s):
            res[PBOXES[b][i]] |= (x & (1 << b))
    return res

def H(m):
    assert len(m) % BLOCKSIZE == 0
    state = INIT[:]
    for b in blocks(m):
        for i, c in enumerate(b):
            state[i] ^= c
        for _ in range(8):
            state = permute(state)
            state = [SBOX[b] for b in state]
    return bytes(state)

if __name__ == "__main__":
    import os

    print("Who lives in a pineapple under the sea?")
    a = bytes.fromhex(input("> ").strip())
    b = bytes.fromhex(input("> ").strip())
    assert a != b
    assert H(a) == H(b)
    
    print(os.environ["FLAG"])