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;
using System.Linq;

namespace ITP1_3_C_Swapping_Two_Numbers
{
    class Program
    {
        static void Main(string[] args)
        {
            string[] nums = null;
            do
            {
                if ( nums != null )
                    Console.WriteLine( nums.Select( int.Parse ).OrderBy( n => n ).Select( n => n.ToString() ).Aggregate( (acc, s) => acc + " " + s ) );
                nums = Console.ReadLine().Split( ' ' );
            } while ( nums[ 0 ] != "0" || nums[ 1 ] != "0" );
        }
    }
}