#include<cstdio>

#include<cstring>

#include<algorithm>

using namespace std;

int main()

{char a1[100],b1[100];

gets(a1);

gets(b1);

int a[100],b[100];

int sum=0,lena,lenb;

lena=strlen(a1);

lenb=strlen(b1);

for (int i=0;i<=lena-1;i++)

a[lena-i]=a1[i]-48;

for (int i=0;i<=lenb-1;i++)

b[lenb-i]=b1[i]-48;

for (int i=lenb;i>0;i--)

for (int j=lena;j>0;j--)

{sum=sum+b[i]*a[j];

}

cout<<sum;

}