#include <iostream>
#include <sstream>

using namespace std;

int toInt(string s){
    stringstream ss(s);
    int r;
    ss >> r;
    return r;
}

    int multiply( int a,  int b) {
      int wynik = 0;
      while (b > 0) {
        if (b & 1)
          wynik += a;
        a <<= 1;
        b >>= 1;
      }
      return wynik;
    }

int main()
{
    string a, b; int aInt, bInt;
    cin>>a>>b;
    size_t foundA = a.find(",");
    size_t foundB = b.find(",");

    bool isA = false, isB = false;

    if (a.find(",") != string::npos) {
        a.erase(foundA, 1); isA = true;
    }
    if (b.find(",") != string::npos) {
        b.erase(foundB, 1); isB = true;
    }

    aInt = toInt(a); bInt = toInt(b);
    if(aInt == 0 || bInt == 0){
        cout<<0<<endl;
        return 0;
    }

    int result = multiply(aInt, bInt);
    int comma = 0;
    if(isA){
        comma+=a.size()-foundA;
    }
    if(isB) {
        comma+=b.size()-foundB;
    }
    //cout<<comma<<endl;
    //cout<<comma<<endl;
    string s = to_string(result);
    if(s.size()< comma){
        cout<<"0,";
    }
    if(s.size()== comma){
        cout<<"0";
    }
    for(int i = 0; i <= s.size(); i++){
        if(s.size()-i == comma){
            cout<<",";
        }
        cout<<s[i];
    }
}