#include <iostream>
using namespace std;

bool judge(char c)
{
	if(c>='0'&&c<='9')
		return true;
	return false;
}

int main()
{
	char c;
	int a=0,b=0;
	while(judge(c=getchar()))
		a+=c-'0';
	while(judge(c=getchar()))
		b+=c-'0';
	cout<<a*b<<endl;
	system("pause");
	return 0;
}