#include<iostream>
#include<set>
#include<vector>
using namespace std;
vector<string>ans;
set<string>out;
int N;
main()
{
    cin>>N;
    for(int i=0;i<N;i++)
    {
        string s,t;cin>>s>>t;
        out.insert(s);
        ans.push_back(t);
    }
    for(string&t:ans)if(out.find(t)==out.end())cout<<t<<endl,out.insert(t);
}