include

using namespace std;

int main() {

int n;
int sum = 0;
int i = 0;
cin >> n;
int a[15];
while (n > 0) {
	a[i] = n % 10 ;
	n = n / 10;
	i++;
}

// for (int x = 0; x < i; x++) { // cout << a[x] << "\n"; // }

int m;
int j = 0;
cin >> m;
int b[15];
while (m > 0) {
	b[j] = m % 10 ;
	m = m / 10;
	j++;
}

// for (int y = 0; y < j; y++) { // cout << b[y] << "\n"; // }

for (int x = 0; x < i; x++) {
	for (int y = 0; y < j; y++) {
		sum += a[x] * b[y];
	}
}
cout << sum;
return 0;

}