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: WA: Presentation Error)

import java.util.Scanner;

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

		int x = 0;
		int y = 0;
		
		while ( true ) {
			x = sc.nextInt ();
			y = sc.nextInt ();

			if ( x == 0 && y == 0 ) {
				break;
			}


			if ( y < x ) {
				output.append ( y + " " + x + "\n" );
			} else {
				output.append ( x + " " + y + "\n" );
			}
		}
		System.out.println ( output );
		sc.close ();
	}
}