import java.util.*;
class struct implements Comparable<struct>{
    int x,y;
    public struct(int x,int y) {
        this.x = x;
        this.y = y;
    }
    public int compareTo(struct a) {
        if(this.x!=a.x) return this.x-a.x;
        else return this.y-a.y;
    }
}
public class Main{
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        struct a[] = new struct[100];
        for(int i=0;i<n;i++) {
            int x = sc.nextInt();
            int y = sc.nextInt();
            a[i] = new struct(x,y);
        }
        Arrays.sort(a,0,n);
        for(int i=0;i<n;i++)
        {
            System.out.println(a[i].x+" "+a[i].y);
        }
    }
}