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;

// 2 つの数の交換

public class ITP1_3_C
{
    public static void Main(string[] args)
    {
        //var exStdIn = new System.IO.StreamReader( "input.txt" );
        //System.Console.SetIn( exStdIn );

        while (true)
        {
            int[] input = Console.ReadLine().Split(' ').Select(x => int.Parse(x)).ToArray();
            if (input[0] == 0 && input[1] == 0)
            {
                break;
            }
            if (input[0] < input[1])
            {
                Console.WriteLine($"{input[0]} {input[1]}");
            }
            else
            {
                Console.WriteLine($"{input[1]} {input[0]}");
            }
        }
    }
}