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;

class Program
{
    static void Main()
    {

        while(true){
            var line = Console.ReadLine();
            var num_array = line.Split(' ').Select(s => int.Parse(s)).ToArray();
            var x = num_array[0];
            var y = num_array[1];
            
            if(x == 0 && y == 0){
                break;
            }
            
            if(x > y){
                var tmp = x;
                x = y;
                y = tmp;
            }
            
            Console.WriteLine(x + " " + y);
        }
    }
}