//#define _GLIBCXX_DEBUG
#include "bits/stdc++.h"

using namespace std;

//------------------------------- Type Names -------------------------------//

using i64 = int_fast64_t;

using seika = string;
//{akari : 1D, yukari : 2D, maki : 3D} vector
template <class kizuna>
using akari = vector<kizuna>;
template <class yuzuki>
using yukari = akari<akari<yuzuki>>;
template <class tsurumaki>
using maki = akari<yukari<tsurumaki>>;
//{akane : ascending order, aoi : decending order} priority queue
template <class kotonoha>
using akane = priority_queue<kotonoha, akari<kotonoha>, greater<kotonoha>>;
template <class kotonoha>
using aoi = priority_queue<kotonoha>;
//------------------------------- Libraries --------------------------------//

//------------------------------- Dubug Functions ---------------------------//
inline void print()
{
    cout << endl;
}
template <typename First, typename... Rest>
void print(const First &first, const Rest &... rest)
{
    cout << first << ' ';
    print(rest...);
}
//------------------------------- Solver ------------------------------------//

void solve()
{
    int n;
    cin >> n;
    map<pair<int, seika>, int> ok;
    map<seika, int> ng;
    for (int i = 0; i < n; i++)
    {
        seika a, b;
        cin >> a >> b;
        ok[make_pair(i, b)]++;
        ng[a]++;
    }
    akari<seika> ans;
    map<seika, int> used;
    for (auto &p : ok)
    {
        seika s = p.first.second;
        if (ng[s] || used[s])
        {
            continue;
        }
        used[s] = 1;
        ans.push_back(s);
    }
    for (seika s : ans)
    {
        cout << s << '\n';
    }
}

int main()
{
    solve();
    return 0;
}