#include<iostream> #include<string> #include<vector> #include<map> using namespace std; signed main(){ map<string,int> s; vector<string> v; int n; cin>>n; for(int i = 0; i < n; i++){ string a, b; cin>>a>>b; s[a]++; s[b]; v.push_back(b); } for(int i = 0; i < v.size(); i++){ if(!s[v[i]]){ cout<<v[i]<<endl; s[v[i]] = 1; } } return 0; }