import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.Scanner;
import java.io.BufferedReader;
import java.io.InputStreamReader;

public class hgg {

    /**
     * @param args
     */
    public static ArrayList<concho> listcho = new ArrayList<concho>();
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner sc = new Scanner(new BufferedReader(new InputStreamReader(System.in)));
        int a = sc.nextInt();
        for (int i = 0; i < a; i++) {
            listcho.add(new concho(sc.nextInt(),sc.nextInt()));
        }
        Collections.sort(listcho, new Comparator<concho>() {

            public int compare(concho o1, concho o2) {
                // TODO Auto-generated method stub
                if(o1.kg<o2.kg) return 1;
                if(o1.kg>o2.kg) return -1;
                return 0;
            }
        });
        for (concho item : listcho) {
            System.out.println(item.tuoi+" "+item.kg);
        }
    }
    public static class concho
    {
        int tuoi;
        int kg;
        public concho(int t, int k)
        {
            tuoi=t; kg=k;
        }
    }

}