using System;

public class Program

{

    public static void Main()

    {

        string outputString = "Given string '{0}' has {1} alphabets.";

        string input = "helloworld";

        Console.WriteLine(outputString, input, ValidateString(input)? "only":"also other than");

        input = "hello world!";

        Console.WriteLine(outputString, input, ValidateString(input)? "only":"also other than");

    }

    public static bool ValidateString(string input){

        // upper case : 65(A) - 91(Z)

        // lower case : 97(a) - 122(z)

        foreach(char c in input){

            int ascii = (int)c;                     

            if(!((ascii>=65 && ascii<=91) || (ascii>=97 && ascii<=122))){

                return false;

            }

        }

        return true;

    }

}