#include <iostream>
#include<map>
#include<set>
#include<vector>
#include<algorithm>
#include<numeric>
#include<math.h>
using ll = long long;
#define rep(i,n) for(int i = 0;i<n;i++)
#define req(i,n) for(int i = 1;i<=n;i++)
#define rrep(i,n) for(int i = n-1;i>=0;i++)
#define ALL(a) a.begin(),a.end()
using namespace std;
int main(){
    map<string, int> mp1, mp2;
    int n; cin >> n;
    string s;
    rep(i, n) cin >> s,mp1[s]++;
    rep(i, n - 1) cin >> s, mp2[s]++;
    for (auto it = mp1.begin(); it != mp1.end(); it++) {
        if (it->second != mp2[it->first])cout << it->first << endl;
    }
}