C# 小学生算数

class Program
    {
        static void Main(string[] args)
        {
            int a = Int32.Parse(Console.ReadLine());//题目是小学生算数，两个数相加，求需要多少次进位，整数不超过9位
            int b = Int32.Parse(Console.ReadLine());
            int c = 0;
            int d = 0;
            for (int i = 9; i >= 0; i--)
            {
                c = (a % 10 + b % 10 + c) > 9 ? 1 : 0;
                d += c;
                a /= 10;
                b /= 10;
            }
            Console.WriteLine("{0}",d);
            Console.ReadKey();
        }
    }