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.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Main {
	
	public static void main(String[] args) {
		try {
			BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
			int i = 1;
			while (true) {
				String str = reader.readLine();
				String[] arr = str.split(" ");
				int x = Integer.parseInt(arr[0]);
				int y = Integer.parseInt(arr[1]);

				if (x == 0 && y == 0) {
					break;
				}
				
				if (x < y) {
					System.out.println(x + " " + y);
				} else {
					System.out.println(y + " " + x);
				}
			}
		} catch (IOException e) {
			e.printStackTrace();
		}
	}

}