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: Accepted)

import java.io.*;
public class Main {
	public static void main(String[] args){
		BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
		try{
        	while(true) {
        		String line = reader.readLine();
        		String[] num = line.split(" ", -1);
        		int x = Integer.parseInt(num[0]);
        		int y = Integer.parseInt(num[1]);
        		if (x == 0 && y == 0) {
        			break;
        		} else {
        			if (x > y) {
        				System.out.println(y + " " + x);
        			} else {
        				System.out.println(x + " " + y);
        			}
        		}
        	}
        } catch (IOException e) {
          System.out.println(e);
        } catch (NumberFormatException e) {
          System.out.println("error");
        }
    }
}