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: Wrong Answer)

// This file is a "Hello, world!" in C# language by Mono for wandbox.
using System;

using System.Linq;

using System.Collections.Generic;

namespace Wandbox
{
    class Program
    {
        static void Main(string[] args)
        {
            while (true)
            {
                var a = Console.ReadLine().Split(' ');
                if (a[0] == "0" && a[1] == "0")
                    break;
                Console.WriteLine("{0} {1}",a[1], a[0]);
                }
            
        }
    }
}