#include <map>
#include <iostream>

using namespace std;

int main() {
    map<int, int> t;
    t[1] = 10;
    t[1000] = 100;
    for (map<int, int> :: iterator it = t.begin(); it != t.end(); ++it)
        cout << it -> first << " " << it -> second << endl;
    return 0;
}