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.ArrayList;
import java.util.Scanner;

public class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        ArrayList<Integer> inputList = new ArrayList<>();
        int a = 0;
        int b = 0;
        while(true) {
            a = sc.nextInt();
            b = sc.nextInt();
            if(a == 0 && b == 0){
                break;
            }
            if(a < b){
                inputList.add(a);
                inputList.add(b);
            }else{
                inputList.add(b);
                inputList.add(a);
            }
            
        }
        
        int count = 0;
        for(int input: inputList){
            if(++count % 2 == 0){
            	count = 0;
            	System.out.println(input);
            }else{
            	System.out.print(input + " ");
            }
        }
        
    }
}