using System;

using System.Linq;

​

namespace symbols

{

    static class Program

    {

        static void Main(string[] args)

        {

            var x = "6975765765";

            var n = x.Length-1;

            var k = n - 2;

            Console.WriteLine((x[n] - '0') + (x[k] - '0'));

        }

    }

}

​