Valid month

// Valid month program

using System;

class Submission
{
    // -------------------------
    // Subprograms
    // -------------------------
    static bool validate_month(int month)
    {

    }


    // -------------------------
    // Main program
    // -------------------------
    public static void Main(string[] args)
    {
        bool valid_month = validate_month(month);
        Console.WriteLine("Thank you. Input accepted.");
    }
}

You can submit as many times as you like. Only your latest submission will be taken into account.