#define _USE_MATH_DEFINES #include <bits/stdc++.h> using namespace std; //template #define rep(i,a,b) for(int i=(a);i<(b);i++) #define rrep(i,a,b) for(int i=(a);i>(b);i--) #define ALL(v) (v).begin(),(v).end() typedef long long int ll; const int inf = 0x3fffffff; const ll INF = 0x3fffffffffffffff; template<class T> inline bool chmax(T& a,T b){ if(a<b){a=b;return 1;}return 0; } template<class T> inline bool chmin(T& a,T b){ if(a>b){a=b;return 1;}return 0; } //template end int main(){ int n; scanf("%d",&n); map<string,int> mp; vector<string> b(n); rep(i,0,n){ string tmp; cin>>tmp>>b[i]; mp[tmp]++; } rep(i,0,n){ if(!mp[b[i]])cout<<b[i]<<endl,mp[b[i]]++; } return 0; }