using System;

​

public class Program

{

    public static void Main()

    {

        Console.WriteLine("DEA Number: " + Dea());

        Console.WriteLine("NPI Number: " + Npi());

    }

​

    public static string Dea()

    {

        Random random = new Random();

        char ch1 = (char)(97 + random.Next(0, 26));

        char ch2 = (char)(97 + random.Next(0, 26));

        int num1 = random.Next(1, 10);

        int num2 = random.Next(1, 10);

        int num3 = random.Next(1, 10);

        int num4 = random.Next(1, 10);

        int num5 = random.Next(1, 10);

        int num6 = random.Next(1, 10);

        string str = (num1 + num3 + num5 + (num2 + num4 + num6) * 2).ToString().Substring(1, 1);

        return ch1.ToString().ToUpper() + ch2.ToString().ToUpper() + num1.ToString() + num2.ToString() + num3.ToString() + num4.ToString() + num5.ToString() + num6.ToString() + str;

    }

​

    public static string Npi()

    {

        string str1 = "";

        try

        {

            Random random = new Random();

            for (int index = 0; index < 9; ++index)

            {

                int num = random.Next(0, 9);

                str1 += num.ToString();

            }

​

            string str2 = str1.Substring(0, 9);

            char[] charArray = ("80840" + str1 + "0").ToCharArray();

            int[] numArray = new int[15];

            for (int index = 0; index < 15; ++index)

                numArray[index] = (int)charArray[index] - 48;

            string str3 = "";

            for (int index = 13; index >= 1; index -= 2)

            {

                numArray[index] = numArray[index] * 2;

                str3 += numArray[index].ToString();

            }

​

            int num1 = 0;

            foreach (char ch in str3)

                num1 += Convert.ToInt32((int)ch - 48);

            for (int index = 12; index >= 0; index -= 2)

                num1 += numArray[index];

            int num2 = num1 + 10;

            int num3 = num2 - num2 % 10 - num1;

            return str2 + (num3 % 10).ToString();

        }

        catch

        {

            return "NPI_RANDOM_ERROR";

        }

    }

}