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.*;

public class Main {
    public static void main(String[] args) throws Exception {
        // Your code here!
        Scanner sc = new Scanner(System.in);
        for(int i=0;i<=3000;i++){
            int a=sc.nextInt();
            int b=sc.nextInt();
            if(a<b){
                System.out.printf("%d %d\n",a,b);
            }else if(a>b){
                System.out.printf("%d %d\n",b,a);
            }else if(a==b && a!=0){
                System.out.printf("%d %d\n",a,b);
            }else{
                break;
            }
        }
    }
}