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) {
		// TODO 自動生成されたメソッド・スタブ
		Scanner scan = new Scanner(System.in);
		int a=Integer.parseInt(scan.next());
		int b=Integer.parseInt(scan.next());
		int temp=0;
		while(a!=0&&b!=0){
			if(a>b){
				temp = a;
				a = b;
				b = temp;
			}
			System.out.println(a+" "+b);
			a=Integer.parseInt(scan.next());
			b=Integer.parseInt(scan.next());
		}	
	}
}