using System;

namespace ConsoleApplication
{
    class Program
    {
        //абвгдеёжзийклмнопрстуфхцчшщъыьэюя
        static void Main ( string [] args )
        {
            Console.WriteLine ( Clamp ( 'я', 'я', 'а', 4 ) );
        }

        static char Clamp ( char currentSymb, char maxSymb, char minSymb, int shift )
        {
            int newSymb = currentSymb + shift;
            if ( newSymb < minSymb )
            {
                return Convert.ToChar ( minSymb + ( minSymb - newSymb ) );
            }
            else if ( newSymb > maxSymb )
            {
                return Convert.ToChar ( minSymb + ( newSymb % maxSymb - newSymb / maxSymb ) );
            }
            else
            {
                return Convert.ToChar ( newSymb );
            }
        }
    }
}