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;

class Program {
    private static int Main() {
        do {
            var input = Console.ReadLine();
            var values = input.Split( ' ' );

            int x = int.Parse( values[ 0 ] );
            int y = int.Parse( values[ 1 ] );

            if( x == 0 && y == 0 ) { break; }

            if( x > y ) {
                var tmp = x;
                x = y;
                y = tmp;
            }

            var output = string.Format( "{0} {1}", x, y );
            Console.WriteLine( output );
        } while( true );

        return 0;
    }
}