백준 10814

import java.util.*;
 
public class Main{
    static public void main(String args[]){
    	Scanner sc = new Scanner(System.in);		 
    	int n = sc.nextInt();
     
    	String arr [][]=new String[n][2];
    	for(int i=0;i<n;i++) {
    		 arr[i][0]=sc.next();
    		 arr[i][1]=sc.next();
    	}
    	 
    	Arrays.sort(arr,(e1,e2) ->{
            if(e1[0].equals(e2[0])){
                return 0;
            }
            else
            	return Integer.parseInt(e1[0])-Integer.parseInt(e2[0]);
        }
        );
    	  StringBuilder sb=new StringBuilder();
          for(int i=0;i<n;i++){
              sb.append(arr[i][0]+" "+arr[i][1]+"\n");
          }
          System.out.println(sb);
	}
     
 }