03. Phoenix Grid

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

namespace ConsoleApplication24
{
    class Program
    {
        public static bool IsPalindrome(string value)
        {
            int min = 0;
            int max = value.Length - 1;
            while (true)
            {
                if (min > max)
                {
                    return true;
                }
                char a = value[min];
                char b = value[max];
                if (char.ToLower(a) != char.ToLower(b))
                {
                    return false;
                }
                min++;
                max--;
            }
        }
        static void Main(string[] args)
        {
            string input = Console.ReadLine();
            while (input != "ReadMe")
            {
                bool palindrom = IsPalindrome(input);
                if (palindrom && !input.Contains(" ") && !input.Contains("_"))
                {
                    Console.WriteLine("YES");
                }
                else
                {
                    Console.WriteLine("NO");
                }
                input = Console.ReadLine();
            }
        }
    }
}