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 Aizu
{
    class OnlineJudge
    {
        public static void Main()
        {
            string input;
            while((input = Console.ReadLine()) != "0 0") {
                var d = input.Split().Select(p => int.Parse(p)).ToArray();
                Console.WriteLine("{0} {1}" , d[d[0] < d[1] ? 0 : 1] , d[d[0] < d[1] ? 1 : 0]);
            }
        }
    }
}