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.io.*;

public class Main{
	public static void main(String[] args)throws IOException{
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		StringBuilder sb = new StringBuilder();
		int temp;
	while(true){
		String str = br.readLine();
		String[] starry = str.split(" ");
		
		int x = Integer.parseInt(starry[0]);
		int y = Integer.parseInt(starry[1]);
		if(x == 0 && y == 0){
		      break;
		}
		else if(x>y){
			temp = x;
			x = y;
			y = temp;
		}
		sb.append(x).append(" ").append(y).append("\n");
	}
		System.out.println(sb);
	}
}