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;

public class test
{
    public static void Main()
    {
        bool judge = true;
        int[] data = new int[2];
        List<string> word = new List<string>();

        while (judge)
        {
            string[] s_data = Console.ReadLine().Trim().Split(' ');
            for(int i = 0; i < s_data.Length; i++)
            {
                data[i] = int.Parse(s_data[i]);
            }

            if (data[0] == 0 && data[1] == 0)
            {
                judge = false;
            }
            else
            {
                Array.Sort(data);
                string ans = data[0] + " " + data[1];
                word.Add(ans);
            }
        }

        for(int i = 0; i < word.Count; i++)
        {
            Console.WriteLine(word[i]);
        }
    }
}