BAEKJOON_11651

import java.io.*;
import java.util.*;


public class Main {

    static class Num{
        private int x;
        private int y;

        public Num(int x, int y) {
            this.x = x;
            this.y = y;
        }
    }

    public static void main(String[] args) throws IOException {

        //y 좌표가 증가하는 순서로
        //y좌표가 같으면 x좌표가 증가하는 순서로 정렬후 출력.

        BufferedReader br =new BufferedReader(new InputStreamReader(System.in));
        BufferedWriter bw =new BufferedWriter(new OutputStreamWriter(System.out));

        List<Num> list = new ArrayList<>();

        int N = Integer.parseInt(br.readLine());

        for(int i=0; i<N; i++){
            StringTokenizer st= new StringTokenizer(br.readLine());
            int x= Integer.parseInt(st.nextToken());
            int y= Integer.parseInt(st.nextToken());
            list.add(new Num(x,y));
        }

        Collections.sort(list,new Comparator<Num>(){
            @Override
            public int compare(Num n1, Num n2){
                if(n1.y > n2.y){
                    return 1;
                }else if(n1.y == n2.y){
                    return n1.x-n2.x;
                }else{
                    return -1;
                }


            }
        });

        for(int i=0; i<list.size(); i++){
            System.out.println(list.get(i).x+" "+list.get(i).y);
        }

    }


}