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;
//using System.Collections.Generic;
using System.Linq;

namespace problem
{
  class Test
  {
    static void Main()
    {
        while (true){
            var a = (Console.ReadLine().Split().Select(int.Parse).ToArray());
            int x = a[0];
            int y = a[1];
            if (x == 0 && y == 0) break;
            if (x < y) Console.WriteLine("{0} {1}", x, y);
            else Console.WriteLine("{0} {1}", y, x);
        }
    }
  }
}