template <typename type>
void print(type it_begin, type it_end) {
    bool start_print = false;
    while(it_end != it_begin) {
        --it_end;
        if (*it_end < 0) {
            start_print = true;
            continue;
        }
        if (start_print) {
            std::cout << *it_end << "\n";
        }
    }
}

int main() {
    std::vector<int> a = {6,1,8,-5, 4};
    print(a.begin(), a.end()); // 8 1 6


}