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;

public class Main {

    public static void main(String[] args) throws IOException {

        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
        StringBuilder sb = new StringBuilder();

        while (true) {
            String data[] = reader.readLine().split(" ");
            int a = Integer.parseInt(data[0]);
            int b = Integer.parseInt(data[1]);
            if(a == 0 && b == 0) break;
            
            
            sb.append(Integer.toString(a > b ? a : b   )).append(Integer.toString( a < b ? b :a)).append("\n");

        }
        
        System.out.print(sb);

    }
}