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;

class Program
{
    static void Main(string[] args)
    {
        var input = "";
        string[] strinputArray;
        int[] intinputArray;
        var inputList = new List<int>();

        do
        {
            input = Console.ReadLine();
            strinputArray = input.Split(' ');
            intinputArray = Array.ConvertAll<string, int>(strinputArray, delegate (string value) { return int.Parse(value); });
            if (intinputArray[0] != 0 || intinputArray[1] != 0)
            {
                inputList.Add(intinputArray[0]);
                inputList.Add(intinputArray[1]);
            }
        } while (intinputArray[0] != 0 || intinputArray[1] != 0);

        for(int i = 1; i <= (inputList.Count / 2); i++)
        {
            if(inputList[(i * 2) - 2] <= inputList[(i * 2) - 1])
            {
                Console.WriteLine(inputList[(i * 2) - 2] + " " + inputList[(i * 2) - 1]);
            }
            else
            {
                Console.WriteLine(inputList[(i * 2) - 1] + " " + inputList[(i * 2) - 2]);
            }
        }
    }
}