import java.util.Arrays;
import java.util.Scanner;

class Point implements Comparable<Point>{
    int x, y;
    Point(int x, int y) {
        this.x = x;
        this.y = y;
    }
    @Override
    public int compareTo(Point o) {
        if(this.x < o.x) {
            return -1;
        } else if(this.x == o.x) {
            if(this.y < o.y) {
                return -1;
            } else if(this.y == o.y) {
                return 0;
            } else {
                return 1;
            }
        } else {
            return 1;
        }
    }
}

public class Main {
    public static StringBuilder sb = new StringBuilder();

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        Point[] pAry = new Point[n];
        for(int i = 0; i < n; i++) {
            int x = sc.nextInt();
            int y = sc.nextInt();
            pAry[i] = new Point(x,y);
        }
        Arrays.sort(pAry);
        for(Point p : pAry) {
            sb.append(p.x + " " +  p.y + "\n");
        }
        System.out.println(sb);
    }
}