Problem:
Swapping Two Numbers

Write a program which reads two integers x and y, and prints them in ascending order.

Input

The input consists of multiple datasets. Each dataset consists of two integers x and y separated by a single space.

The input ends with two 0 (when both x and y are zero). Your program should not process for these terminal symbols.

Output

For each dataset, print x and y in ascending order in a line. Put a single space between x and y.

Constraints

0 ≤ x, y ≤ 10000

the number of datasets ≤ 3000

Sample Input

3 2
2 2
5 3
0 0

Sample Output

2 3
2 2
3 5

Solution in JAVA (judge verdict: Accepted)

import java.util.Scanner;

class Main{
  public static void main(String[] args) {
    
	  Scanner sc = new Scanner(System.in);
	  
	  int x = -1;
	  
	  int y = 1;
	  
	  while(x!=0 || y!=0){
		  
		  x = sc.nextInt();
		  
		  y = sc.nextInt();
		  
		  if(x > y){
			  System.out.println(y+" "+x);
		  }else if (x < y){
			  System.out.println(x+" "+y);
		  }else if(x == y){
			  if(x==0 && y==0){
				  //何もしない
			  }else{
				  System.out.println(x+" "+y);
			  }
		  } 
		  
	  }
 

  }
}