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