#include <bits/stdc++.h>
using namespace std;
#define modulo 1000000007
#define mod(mod_x) ((((long long)mod_x+modulo))%modulo)
#define Inf 10000000



int main(){
	
	int N;
	cin>>N;
	
	vector<string> A,B;
	
	set<string> S;
	
	for(int i=0;i<N;i++){
		string a,b;
		cin>>a>>b;
		A.push_back(a);
		B.push_back(b);
		S.insert(a);
	}
	
	for(int i=0;i<N;i++){
		if(S.count(B[i])==false){
			cout<<B[i]<<endl;
			S.insert(B[i]);
		}
	}
	
	return 0;
}