using System;

public class Program

{

    public static void Main()

    {

        string str = ".forgeeksskeegr..of.";

        Console.WriteLine(isPali(str));

    }

    private static bool isPali(string str)

    {

        var strLen = str.Length;

        if (strLen == 0 || strLen == 1)

            return true;

​

        int s = 0;

        int e = strLen - 1;

​

        while (e>s)

        {

            while (!Char.IsLetter(str[s])) {

                if (s<e)

                    s++;

                else

                    return false;

            }

            while (!Char.IsLetter(str[e])) {

                if (e>1)

                    e--;

                else

                    return false;

            }

​

            if (str[s] == str[e])

            {

                s++;

                e--;

            } 

            else

            {

                if (s == 0)

                {

                    e--;

                    strLen--;

                }

                else

                    return false;

            }

        }

​

        return true;

    }

}