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.InputStreamReader;

class Main {
    public static void main(String[] args) throws Exception {
    	BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

        while(true){
        	String strArr[] = br.readLine().split(" ");
            int a=Integer.parseInt(strArr[0]);
            int b=Integer.parseInt(strArr[1]);

            if(b<a){
            	int c=a;
            	a=b;
            	b=c;
            	System.out.println(a+" "+b);
            }
            else if(a==0 && b== 0){
            	break;
            }
        }
    }
}