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.Collections.Generic;
namespace ITP1_3_C
{
    class Problem
    {

        public static List<string[]> getinputdata (){

            List<string[]> list_temp = new List<string[]>();
            string strdata = Console.ReadLine ();

            while (strdata!=null) {

                string[] s_temp = strdata.Split (' ');

                list_temp.Add (s_temp);

                strdata = Console.ReadLine ();

            }

            return list_temp;
        }



        public static void Main (string[] args)
        {
            List<string[]> arr_result = new List<string[]>();
            arr_result = getinputdata ();

            for (int i = 0; i < (arr_result.Count)-1; i++)
            {
                if (int.Parse(arr_result[i][0]) <  int.Parse(arr_result[i][1]))
                {
                    Console.WriteLine(arr_result[i][0] + " " + arr_result[i][1]);
                }else{
                    Console.WriteLine(arr_result[i][1] + " " + arr_result[i][0]);

                }
            }



        }
    }
}