using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine(IsPalindrom("c ,    baabc"));

    }

    public static bool IsPalindrom(string input)

    {

        if (input.Length == 0)

            return true;

        int i = 0;

        int j = input.Length-1;

        while(i < j)

        {

            while (!isChar(input[i]) && i<j)

                i++;

            while (!isChar(input[j]) && i<j)

                j--;

            if (i >= j)

                return false;

            if (input[i] != input[j])

                return false;

            i++;

            j--;

        }

        return true;

    }

    public static bool isChar(char c)

    {

        return 'a' <= c && c <= 'z';

    }

}