BAEKJOON_11650

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

public class Main {
    private int x;
    private int y;
    public Main(int x, int y){
        this.x = x;
        this.y = y;
    }

    public int getX() {
        return x;
    }

    public void setX(int x) {
        this.x = x;
    }

    public int getY() {
        return y;
    }

    public void setY(int y) {
        this.y = y;
    }

    public static void main(String[] args) throws IOException {
        BufferedReader br =new BufferedReader(new InputStreamReader(System.in));
        BufferedWriter bw =new BufferedWriter(new OutputStreamWriter(System.out));

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

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

        for(int i=0; i<test_case; i++){
            StringTokenizer st = new StringTokenizer(br.readLine());
            int a = Integer.parseInt(st.nextToken());
            int b = Integer.parseInt(st.nextToken());
            list.add(new Main(a,b));
        }

        Collections.sort(list,new Comparator<Main>(){
            @Override
            public int compare(Main m1, Main m2){
                if(m1.x > m2.x){
                    return 1;
                }else if(m1.x == m2.x){
                    if(m1.y > m2.y){
                        return 1;
                    }
                }
                return -1;
            }
        });

        for(Main m : list){
            System.out.println(m.x+" "+m.y);
        }
    }
}