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 C# (judge verdict: Accepted)

using System;

class A{
	public static void Main(){




		for (int i=0; i<3000; i++) {

			string[] input = Console.ReadLine ().Split (' ');
			int a = int.Parse (input [0]);
			int b = int.Parse (input [1]);

			if (a == b && a == 0) {
				break;
			} else if (a > b) {				
				Console.WriteLine ("{0} {1}", b, a);
			}else{
				Console.WriteLine ("{0} {1}", a, b);
			}
		}
	}
}