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;
using System.Collections.Generic;

namespace Algorithm
{
    class Program
    {
        static void Main(string[] args)
        {
            var read = "";
            var array = new String[2];
            while (!string.IsNullOrEmpty(read = Console.ReadLine()))
            {
                array = read.Split();
                if (!(array[0] == "0" && array[1] == "0"))
                {
                    if (int.Parse(array[1]) < int.Parse(array[0]))
                        Console.WriteLine($"{array[1]} {array[0]}");
                    else
                        Console.WriteLine($"{array[0]} {array[1]}");
                }
            }
        }
    }
}