using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine(IsPalindrome2("abba"));

    }

    private static bool IsPalindrome(string input)

    {

        bool isPalindrome = true;

        int inputLength = input.Length;

        int offset = 0;

        if (input.Length % 2 != 0)

        {

            offset = 1;

        }

        var inputStack = new System.Collections.Stack();

        for (int i= 0; i < inputLength / 2; i++)

        {           

            inputStack.Push(input[i]);

        }

        for (int i = (inputLength / 2) + offset; i < inputLength; i++)

        {

            if (input[i] == Convert.ToChar(inputStack.Pop()))

            {

                continue;

            }

            else

            {

                return false;

            }

        }

        return isPalindrome;

    }

    private static bool IsPalindrome2(string input)

    {

        var returnValue = true;

        var inputLength = input.Length;

        for (int counter = 0; counter < input.Length / 2; counter++)

        {           

            if (input[counter] == input[inputLength - 1])

            {

                continue;

            }

            else

            {

                Console.WriteLine(string.Format("{0} = {1}",input[counter], input[inputLength - 1]));

                returnValue = false;

            }

        }

        return returnValue;

    }

}