using System;
 
namespace Task8
{
    class Program
    {
        static void Main(string[] args)
        {
            int a, b, ab, summ;
            Console.Write("Введите двухзначное число - ");
            ab = Int32.Parse(Console.ReadLine());
            if (ab >= 10 && ab<=99)
            {
                b = ab % 10;
                a = (ab - b)/10;
                summ = a + b;
                Console.WriteLine("Сумма цифр числа - {0} ", summ);
                Console.ReadKey();
            }
            else
            {
                Console.WriteLine("Ошибка");
                Console.ReadKey();
            }
        }
    }
}

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