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.Linq;

namespace AOJ {
    public class Probrem {
        public static void Main() {
            string str;
            while ((str = Console.ReadLine()) != "0 0") {
                var data = str.Split().Select(int.Parse).ToArray();
                Console.WriteLine(data[0] > data[1] ? data[1] + " " + data[0] : data[0] + " " + data[1]);
            }
        }
    }
}