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.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Scanner;
public class Main {
	public static void main(String[] args) throws IOException {
				
		BufferedReader input=new BufferedReader(new InputStreamReader(System.in));
		Scanner sc = new Scanner(input);
		
	    while(true){
	    	int a=sc.nextInt();
	    	int b=sc.nextInt();
	    	if(a+b==0){sc.close();break;}
	    	else if(a>b)System.out.println(a+" "+b);
	    	else System.out.println(b+" "+a);
	    	}
	    }
	     	
	}