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: Wrong Answer)

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Swapping_Two_Numbers
{
    class Program
    {
        static void Main(string[] args)
        {
            List<string> input = new List<string>();

            while (true)
            {
                string temp = "";

                temp = Console.ReadLine();
                if (temp.Equals("0 0"))
                {
                    break;
                }

                input.Add(temp);
            }

            foreach (string item in input)
            {
                string[] temp = item.Split(' ');
                int num1 = int.Parse(temp[0]);
                int num2 = int.Parse(temp[1]);

                if (num1 >= num2)
                {
                    Console.WriteLine(num1 + " " + num2);
                }
                else
                {
                    Console.WriteLine(num2 + " " + num1);
                }

            }
        }
    }
}