using System;
using System.Collections.Generic;
using System.Linq;
namespace apps
{
    class Program
    {

        static int GetInt() { return int.Parse(Console.ReadLine()); }
        static string Get() { return Console.ReadLine(); }

        static void Main()
        {
            // character multiplier
            string[] inp = Get().Split(' ').ToArray();
            //------------------------------------------------------------
            //------------------------------------------------------------
            List<int> codes1 = new List<int>();
            List<int> codes2 = new List<int>();
            //------------------------------------------------------------
           //------------------------------------------------------------
            foreach (char c in inp[0]) { int code = (int)c; codes1.Add(code); }
            foreach (char c in inp[1]) { int code = (int)c; codes2.Add(code); }
            //------------------------------------------------------------
            //------------------------------------------------------------
            int empty = 0;
            int total = 0;
            //------------------------------------------------------------
            //------------------------------------------------------------
            while (true)
            {
                if (codes1.Count == 0 && codes2.Count==0) { break;   }
                if (codes1.Count == 0) {empty = 1; break;}
                if (codes2.Count == 0) { empty = 2; break;  }
                int sum= (codes1[0] * codes2[0]);
                total += sum;
                codes1.RemoveAt(0);
                codes2.RemoveAt(0);
            }
            //------------------------------------------------------------
            //------------------------------------------------------------
            if (empty == 1) { foreach (int value in codes2) { total += value; } }
              if (empty == 2) { foreach (int value in codes1) { total += value; } }
            //------------------------------------------------------------
            //------------------------------------------------------------

                   Console.WriteLine(total);

        }

        }// END MAIN

    }