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.Collections.Generic;
using System.Linq;
using System.Text;


namespace swap2
{
    class Program
    {
        static void Main(string[] args)
        {
            for(int t = 0; true; t++){
            string[] str = Console.ReadLine().Split(' ');
            if (str[0] == "0" && str[1] == "0") {
                break;
            }
            int[] answer = new int[2];
            for (int i = 0; i < 2; i++) {
                answer[i] = int.Parse(str[i]);
            }
            Array.Sort(answer);
            Console.WriteLine("{0} {1}", answer[0], answer[1]);
        }
        }

    }
}