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 ConsoleApplication2
{
    class Program
    {
        static void Main(string[] args)
        {
            //string[] s =Console.ReadLine().Split(',');

            //int w = int.Parse(s[0]);
            //List<string> stringList1 = new List<string>();
            //List<string> stringList2 = new List<string>();

            for (int i = 0; ; i++)
            {
                string[] s = Console.ReadLine().Split(' ');
                int a = int.Parse(s[0]);
                int b = int.Parse(s[1]);


                if ((a == 0) && (b == 0)) break;

                if (a < b)
                {
                    Console.WriteLine(a + " " + b);
                }
                else
                {
                    Console.WriteLine(b + " " + a);
                }
            }

            //int n =int.Parse(s);
        }
    }
}