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.io.*;

class Main{
	
	public static void main(String[] args)throws IOException{
		
		BufferedReader input = new BufferedReader(new InputStreamReader(System.in));
		StringBuilder result = new StringBuilder();
		
		while(true){
			String tmp = input.readLine();
			String[] strInput = tmp.split(" ");
			int x = Integer.parseInt(strInput[0]);
			int y = Integer.parseInt(strInput[1]);
			if(x == 0 && y == 0){
				break;
			}
			result.append(y + " " + x);
		}
		
		System.out.println(result);
		
	}
	
}