/*
    Author:zeke
    
    pass System Test!
    GET AC!!
*/
#include <iostream>
#include <queue>
#include <vector>
#include <iostream>
#include <vector>
#include <string>
#include <cassert>
#include <algorithm>
#include <functional>
#include <cmath>
#include <queue>
#include <set>
#include <stack>
#include <deque>
#include <map>
#include <iomanip>
#include <utility>
#include <stack>
using ll = long long;
using ld = long double;
using namespace std;
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
#define all(x) (x).begin(), (x).end()
#define rep3(var, min, max) for (ll(var) = (min); (var) < (max); ++(var))
#define repi3(var, min, max) for (ll(var) = (max)-1; (var) + 1 > (min); --(var))
#define Mp(a, b) make_pair((a), (b))
#define F first
#define S second
#define Icin(s) \
    ll(s);      \
    cin >> (s);
#define Scin(s) \
    ll(s);      \
    cin >> (s);
template <class T>
bool chmax(T &a, const T &b)
{
    if (a < b)
    {
        a = b;
        return 1;
    }
    return 0;
}
template <class T>
bool chmin(T &a, const T &b)
{
    if (b < a)
    {
        a = b;
        return 1;
    }
    return 0;
}
typedef pair<ll, ll> P;
typedef vector<ll> V;
typedef vector<V> VV;
typedef vector<P> VP;
ll MOD = 1e9 + 7;
ll INF = 1e18;
long long GCD(long long a,long long b){
    if(b==0)return a;
    return GCD(b,a%b);
}
unsigned long long LCM(long long a,long long b){
    ll c= a/GCD(a,b);
    return c*b;
}
int main()
{
    cin.tie(0);
    ios::sync_with_stdio(false);
    
    vector<string> vec;
    set<string> s;
    ll n;
    cin>>n;
    vector<string> reg;
    rep(i,n){
        string s1,s2;
        cin>>s1>>s2;
        vec.push_back(s1);
        reg.push_back(s2);
        s.insert(s2);
    }
    vector<string> res;
    sort(all(vec));
    for(auto itr = s.begin(); itr != s.end(); ++itr) {
        string str=*itr;      // イテレータの指す先のデータを表示
        if(!(binary_search(all(vec),str))){
            res.push_back(str);
        }
    }
    rep(i,n){
        if(binary_search(all(res),reg[i])){
            cout<<reg[i]<<endl;
            res.erase(lower_bound(all(res),reg[i]));
        }
    }
}