#include <bits/stdc++.h>
using namespace std;
int main() {
    map<int, string> _map;
    _map[1] = "student_one";
    _map[2] = "student_two";
    _map[3] = "student_three";
    for (auto it = _map.begin(); it != _map.end(); it++) {
        cout << it->first << " " << it->second << endl;
    }
}