#include <iostream>
#include <string>
#include <map>

using namespace std;

void solve() {
    int n;
    cin >> n;

    map<string, int> cnt;
    for (int i = n; i--;) {
        string s;
        cin >> s;
        ++cnt[s];
    }
    for (int i = n - 1; i--;) {
        string s;
        cin >> s;
        --cnt[s];
    }

    for (auto [s, c] : cnt) {
        if (c != 0) cout << s << "\n";
    }
}

int main() {
    cin.tie(nullptr);
    ios::sync_with_stdio(false);

    solve();

    return 0;
}