#include <bits/stdc++.h>
using namespace std;

int main()
{
    int n; cin >> n;
    vector<string> B(n);
    map<string, bool> ng;
    for(int i=0;i<n;++i)
    {
        string a, b;
        cin >> a >> b;
        B[i] = b;
        ng[a] = true;
    }
    for (int i=0; i<n; ++ i)
    {
        string name = B[i];
        if (ng[name]) continue;
        ng[name] = true;
        cout << name << endl;
    }
    return 0;
}