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

namespace ConsoleApplication23
{
    class Program
    {
        static bool iden (char a)
        {
            char n;
            bool v = false;
            n = 'A';
            while (n <= 'z')
            {
                if (n == a)
                {
                    v = true;
                    n = '{';
                }
                n++;
            }
            return v;
        }

        static void Main(string[] args)
        {
            char a;
            bool tf;
            Console.WriteLine("Enter a character: ");
            a = char.Parse(Console.ReadLine());
            tf = iden(a);
            Console.WriteLine(tf);
        }
    }
}