#include <bits/stdc++.h>

using namespace std;

map<string,string> m;

map<string,int> p;


int main(){
    int n;
    cin >> n;
    vector<string> a(n);
    vector<string> b(n);
    for(int i=0;i<n;i++){
        cin >> a[i] >> b[i];
        m[b[i]]=b[i];
        p[b[i]]=0;
    }
    for(int i=0;i<n;i++){
        m[a[i]]=b[i];
    }
    for(int i=0;i<n;i++){
        if(m[b[i]]==b[i] && p[b[i]]==0){
            cout << b[i] << endl;
            p[b[i]]++;
        }
    }
}