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;

public class Hello
{
    public static void Main()
    {
        string[] s;

        while((s = Console.ReadLine().Split(' ')) != null)
        {
            if (s[0] == "0" && s[1] == "0") break;
            string s1 = s[0];
            string s2 = s[1];
            Console.WriteLine("{0} {1}", s2, s1);
        }
    }
}