#include
int main()
{
int a,b,a1,b1,b0;
int s=0;
printf("a=");
scanf("%d",&a);
printf("b=");
scanf("%d",&b);
b0=b;
while(a)
{
a1=a%10;
a/=10;
b=b0;
while(b)
{
b1=b%10;
b/=10;
s=s+a1*b1;
}
}
printf("%d\n",s);
return 0;
}