# import pypyjit
# pypyjit.set_param('max_unroll_recursion=-1')
import sys
from itertools import combinations, permutations, product, accumulate, groupby
from collections import defaultdict, deque, Counter
from functools import reduce
from operator import add, mul
import heapq
import bisect
import math
import copy

# sys.setrecursionlimit(10 ** 9)
input = lambda: sys.stdin.readline().rstrip()
INF = float("inf")
MOD = 10 ** 9 + 7

N = int(input())
A = list(input().split())
B = list(input().split())
a_counter = Counter(A)
b_counter = Counter(B)
for k, v in a_counter.items():
    if b_counter[k] == v:
        continue
    else:
        print(k)
        exit()