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;

namespace tes
{
    class Program
    {
        static void Main(string[] args)
        {
            int a = 0,i=0;
            int[] x = new int[100000];
            int[] y = new int[100000];

            while (a < 20)
            {
                var line1 = Console.ReadLine().Split();

                x[i] = int.Parse(line1[0]);
                y[i] = int.Parse(line1[1]);
                if ((x[i] == 0) && (y[i] == 0))
                {
                    break;
                }
                i++;

            }

            for (int z = 0; z < i; z++)
            {
                if (x[z] < y[z])
                {
                    Console.WriteLine(x[z] + " " + y[z]);
                }
                else if (x[z] > y[z])
                {
                    Console.WriteLine(y[z] + " " + x[z]);
                }
                else
                {
                    Console.WriteLine(x[z] + " " + y[z]);
                }
            }


        }
    }
}