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;
using System.Text;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            

            List<List<int>> Input = new List<List<int>>();


            int Item1;
            int Item2;
            int temp;

            for(int i = 0; i < 3001; i++)
            {
                var result1D = Console.ReadLine().Split(' ');

                Item1 = int.Parse(result1D[0]);

                Item2 = int.Parse(result1D[1]);


                if(Item1 > Item2)
                {
                    temp = Item2;
                    Item2 = Item1;
                    Item1 = temp;
                }


                List<int> localList = new List<int>();

                if (Item1 == 0 && Item2 == 0) break;

                localList.Add(Item1);
                localList.Add(Item2);

                Input.Add(localList);
            }

            foreach(var result in Input)
            {
                Console.WriteLine("{0} {1}", result[0], result[1]);
            }

        }



    }

}