Răspuns :

Petruccinatorid

#include <iostream>

size_t produs(const std::string& n) {

size_t pr = 1;

for (size_t i = 0; i < n.size(); ++i)

 if (n[i] & 1)

  pr *= n[i] - '0';

 

return pr;

}

int main() {

std::string n;

std::cin >> n;

std::cout << produs(n);

}

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