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: Wrong Answer)

import java.util.Scanner;

public class Main {
	public static void main(String []args){
		//????????£?????????????????????
		Scanner sc = new Scanner(System.in);

		//??°?????????
		while(true){
			//x???????????????
			int x = sc.nextInt();
			//y???????????????
			int y = sc.nextInt();
			//??????????????°??????0?????´???
			if(x == 0 && y == 0){
				break;
			}
			//????????????????°??????????????????????
			if(x < y){
				System.out.println(y + " " + x);
			}else if(x == y){
				System.out.println(x + " " + y);
			}else if(y < x){
				System.out.println(x + " " + y);
			}
		}
	}
}