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;
public class Main{
    public static void main(String[] args){
        Scanner stdIn=new Scanner(System.in);
        while(true){
            int x=stdIn.nextInt();
            int y=stdIn.nextInt();
            if(x==0&&y==0){
                break;
            }
            if(x>y){
                int tmp=x;
                x=y;
                y=tmp;
            }
            System.out.println(x+" "+y);
        }
    }
}