from collections import defaultdict

N = int(input())
A = list(map(str,input().split()))
B = list(map(str,input().split()))
Adic = defaultdict(int)
for i in range(N):
  word = A[i]
  Adic[word] += 1
for i in range(N-1):
  word = B[i]
  Adic[word] -= 1
for x in Adic.keys():
  if Adic[x] != 0:
    print(x)