include

using namespace std;

int a[10000000], b[100000000]; char s[10000000]; int len_1; int len_2; long long int total; int main () { scanf("%s", s + 1); len_1 = strlen(s + 1); for (int i = 1; i <= len_1; i++) a[i] = s[len_1 + 1 - i] - 48; scanf("%s", s + 1); len_2 = strlen(s + 1); for (int i = 1; i <= len_2; i++) b[i] = s[len_1 + 1 - i] - 48; for (int i = 1; i <= len_1; i++) for (int j = 1; j <= len_2; j++) total += a[i] * b[j]; cout << total; }