#!/usr/bin/env python3
import sys

def main():
    from collections import defaultdict
    d = defaultdict(int)
    N = int(input())
    A = list(input().split())
    B = list(input().split())
    for aa in A:
        d[aa] += 1
    for bb in B:
        d[bb] -= 1
    for k, v in d.items():
        if v == 1:
            print(k)

if __name__ == '__main__':
    main()