#include <iostream>
#include <vector>
#include <map>
using namespace std;
int main(){
    int n;
    cin >> n;
    map<string, vector<string> > m;

    string time, code;
    for(int i = 0;i < n;i++){
        cin >> time >> code;
        if(m.find(time) == m.end()){
            vector<string> v;
            v.push_back(code);
            m[time] = v;
        }else{
            m[time].push_back(code);
        }
    }
    map<string, vector<string> >::iterator it = m.begin();
    int flag = 1;
    for(;it != m.end();++it){
        if(it->second.size() > 1){
            flag = 0;
            cout << it->first;
            for(int i = 0;i < it->second.size();i++){
                cout << " " << it->second[i];
            }
            cout << endl;
        }
    }
    if(flag == 1){
        cout << "YES" << endl;
    }
    return 0;
}

C++的，没记错的话应该是AC了，一开始忘了YES这一茬（我是被北方同学带偏了普通话的土生土长的广东人