#include<iostream> using namespace std; int main() { string a,b; cin>>a>>b; unsigned long long c[10000]={0},d=max(a.size(),b.size()); for(int i=0;i<d;i++) { int x=0; c[i]+=(a[i]-'0')*(b[i]-'0'); x=c[i]/10; c[i]%=10; c[i+1]+=x; } for(int i=d;i>=0;i--) { if(c[i]) cout<<c[i]; } return 0; }