#include<iostream>
#include<cstring>
#include<cstdio>
#include<algorithm>
#define N 1004
#define inf 100000000
using namespace std;

int main()
{
    char a[12],b[12];
    while(cin >>a >> b)
    {
        int na,nb,i;
        for(na = 0,i= 0;a[i]!='\0';i++)
        na += a[i] - '0';
        for(nb = 0,i= 0;b[i]!='\0';i++)
        nb += b[i] -'0';
        cout << na * nb << endl;
    }
    return 0;
}