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.Linq;
using System.Text;

namespace aoj1
{
    class Program
    {
        static void Main()
        {
            int[] num;
            for (;;)
            {
                num = IntInput();
                Array.Sort(num);
                if (num[0] != 0 || num[1] != 0)
                {
                    Console.WriteLine("{0} {1}", num[0], num[1]);
                }
                else
                {
                    break;
                }
            }
        }

        static int[] IntInput()
        {
            string[] strs = Console.ReadLine().Split(' ');
            int[] numbers = new int[strs.Length];
            for (int i = 0; i < strs.Length; i++)
            {
                numbers[i] = int.Parse(strs[i]);
            }
            return numbers;
        }
    }
}