#include "iostream" #define ll long long using namespace std; ll a1[100],b1[100]; ll ans=0; int main(){ ll a,b; cin>>a>>b; ll i=1; while(a){ a1[i]=a%10; a/=10; i++; } ll j=1; while(b){ b1[j]=b%10; b/=10; j++; } for(ll ii=1;ii<=i;ii++){ for(ll jj=1;jj<=j;jj++){ ans+=a1[ii]*b1[jj]; } } cout<<ans; return 0; }