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 test{
    static void Main(){
        string[] str;
        str=Console.ReadLine().Split(' ');
        
        int[] num={int.Parse(str[0]),int.Parse(str[1])};
        while (num[0]!=0||num[1]!=0)
        {
            Array.Sort(num);
            if(num[0]==0&&num[1]==0)break;
            Console.WriteLine("{0} {1}",num[0],num[1]);
            str=Console.ReadLine().Split(' ');
            for(int i=0;i<str.Length;i++){
                num[i]=int.Parse(str[i]);
            }
        }
    }
}