S4

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace S4
{
    class Program
    {
        static void Main(string[] args)
        {

            Console.WriteLine("Type a string, it must end with an asterisk");
            string St = Console.ReadLine();
            if (St[St.Length - 1] != '*')
            {
                Console.WriteLine("Invalid string! It didn't end with an asterisk");
            }
            else
            {
                int[] Counter = new int[St.Length];
                for (int i = 0; i < St.Length; ++i)
                {
                    if (St[i] >= 'a'&&St[i]<='z')
                    {
                        Counter[i] = 1;
                    }
                }
                int az = 0;
                for (int i = 0; i < Counter.Length; ++i)
                {
                    if (Counter[i] == 1)
                    { ++az; }
                }
                Console.WriteLine("There are {0} small English letters in this string", az);
            }
        }
    }
}