n = int(input())
A = list(map(str, input().split()))
B = list(map(str, input().split()))

from collections import Counter
CA = Counter(A)
CB = Counter(B)

for k, v in CA.items():
    if k not in CB:
        print(k)
        exit()
    else:
        if CB[k] != v:
            print(k)
            exit()