using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Numerics;
using System.Text;
using System.Text.RegularExpressions;

namespace HomeWork
{
    class Program
    {
        static void Main()
        {
            var strs = Regex.Split(Console.ReadLine(), @"\W+");
            var str1 = strs[0];
            var str2 = strs[1];
            long sum = 0;
            for (int i = 0; i < Math.Max(str1.Length, str2.Length); i++)
            {
                long num1 = 1, num2 = 1;
                if (i < str1.Length) num1 = str1[i];
                if (i < str2.Length) num2 = str2[i];
                sum += num1 * num2;
            }
            Console.WriteLine(sum);
        }
    }
}