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


signed main(){
    ios::sync_with_stdio(false);
    cin.tie(0);
    cout << fixed << setprecision(20);
    
    ll n;
    cin>>n;
    ll INF = -1e9;
    map<string,int> mp;
    string b[n];
    for(int i=0;i<n;i++){
        string a;
        cin>>a>>b[i];
        mp[a] = INF;
        mp[b[i]]++;
    }
    for(int i=0;i<n;i++){
        if(mp[b[i]] >0){
            cout << b[i] << "\n";
            mp[b[i]] = INF;
        }
    }
    

}