#include "bits/stdc++.h"
using namespace std;
typedef long long ll;
typedef pair<int, char> P;
const int INF = (1<<30);
const ll INFLL = (1ll<<60);
const ll MOD = (ll)(1e9+7);

#define l_ength size

void mul_mod(ll& a, ll b){
	a *= b;
	a %= MOD;
}

void add_mod(ll& a, ll b){
	a = (a<MOD)?a:(a-MOD);
	b = (b<MOD)?b:(b-MOD);
	a += b;
	a = (a<MOD)?a:(a-MOD);
}

string b[225816];
set<string> st;

int main(void){
	int n,i;
	string a;
	cin >> n;
	for(i=0; i<n; ++i){
		cin >> a >> b[i];
		st.insert(a);
	}
	for(i=0; i<n; ++i){
		if(st.find(b[i])==st.end()){
			cout << b[i] << endl;
			st.insert(b[i]);
		}
	}
	return 0;
}