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: Wrong Answer)

using System;

class Program
{
    static void Main()
    {
        int a, b;
        string[] arys;
        string result;
        
        //入力情報取得
        arys = Console.ReadLine().Split(' ');
        a = int.Parse(arys[0]);
        b = int.Parse(arys[1]);
        
        //両方 0 の場合は処理を抜ける
        while (a != 0 || b != 0) 
        {
            result = "";
            
            if (a > b) 
            {
                //左が大きい場合は結果を入替える
                result = string.Format("{0} {1}", b, a);
            }
            else
            {
                result = string.Format("{0} {1}", a, b);
            }
            
            //結果表示
            Console.Write(result);
            
            //次の入力情報を取得
            arys = Console.ReadLine().Split(' ');
            a = int.Parse(arys[0]);
            b = int.Parse(arys[1]);
        }
    }
}