from collections import defaultdict
dic=defaultdict(int)
dic2=defaultdict(int)
n=int(input())
a=list(input().split())
b=list(input().split())
sa=set(a)
sb=set(b)

if len(sa)==len(sb):
    for i in a:
        dic[i]+=1
    for i in b:
        dic2[i]+=1
    for i in sa:
        if dic[i] != dic2[i]:
            print(i)
            break
            
elif len(sa)>len(sb):
    t=sa-sb
    print(list(t)[0])
elif len(sa)<len(sb):
    t=sb-sa
    print(list(t)[0])