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 {
        String[] lines = getStdin();
        
        for (int i = 0; i < lines.length; i++){
            String str = lines[i];
            String[] str1 = str.split(" ");
            int j = 0;
            int num = Integer.parseInt(str1[j]);
            int num1 = Integer.parseInt(str1[j + 1]);
            int n = num;
                if (num > num1){
                    num = num1;
                    num1 = n;
                    System.out.println(num + " " + num1);
                } else if (num == 0 && num1 ==0){
                    return;
                } else {
                    System.out.println(num + " " + num1);
                }
        }
    }

  
  private static String[] getStdin() {
    Scanner scanner = new Scanner(System.in);
    ArrayList<String> lines = new ArrayList<>();
    while (scanner.hasNext()) {
      lines.add(scanner.nextLine());
    }
    return lines.toArray(new String[lines.size()]);
  }
  
}