using System;

public class Program

{

    public static void Main()

    {

        //ask for and verify an intager 

        bool loop = false; 

        int first = 0;

        int second; 

        string input;

        while (loop == false)

        {

            Console.WriteLine("Please enter an interger.");

            input = Console.ReadLine();

            loop = Int32.TryParse(input, out first);

            if (loop == false)

            {

                Console.WriteLine("Invalid entry. Must be a whole number.");

            }

        }

        //ask for and verify a second intager 

        do

        {

            Console.WriteLine("Please enter a second interger.");

            input = Console.ReadLine();

            loop = Int32.TryParse(input, out second);

            if (loop == false)

            {

                Console.WriteLine("Invalid entry. Must be a whole number.");

            }

        }while (loop == false);

        Console.WriteLine("first: " + first);

        Console.WriteLine("second: " + second);

        //use a conditional to either count up or down 

        if(first < second)

        {

            for(int i = first; i <= second; i++)

            {

                Console.WriteLine(i + " ");

            }

        }

    }

}