// iostream is too mainstream
#include <cstdio>
// bitch please
#include <iostream>
#include <algorithm>
#include <cstdlib>
#include <vector>
#include <set>
#include <map>
#include <queue>
#include <stack>
#include <list>
#include <cmath>
#include <iomanip>
#define dibs reserve
#define OVER9000 1234567890
#define ALL_THE(CAKE,LIE) for(auto LIE =CAKE.begin(); LIE != CAKE.end(); LIE++)
#define tisic 47
#define soclose 1e-8
#define chocolate win
// so much chocolate
#define patkan 9
#define ff first
#define ss second
#define abs(x) ((x < 0)?-(x):x)
#define uint unsigned int
#define dbl long double
using namespace std;
// mylittledoge
 
int main() {
	cin.sync_with_stdio(0);
	cin.tie(0);
	int N;
	cin >> N;
	long long x =0;
	map<string,int> M;
	for(int i =0; i < N; i++) {
		string s;
		cin >> s;
		if(M.find(s) != M.end()) x +=M[s];
		else {
			int a =M.size();
			x +=a;
			M[s] =a;}
		}
 
	for(int i =0; i < N-1; i++) {
		string s;
		cin >> s;
		x -=M[s];}
 
	ALL_THE(M,it) if(x == it->ss) cout << it->ff << "\n";
	return 0;}
 
// look at my code
// my code is amazing

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

NQptYXJpbmEKam9zaXBhCm5pa29sYQp2aW5rbwpmaWxpcGEKam9zaXBhCmZpbGlwYQptYXJpbmEKbmlrb2xh

5
marina
josipa
nikola
vinko
filipa
josipa
filipa
marina
nikola