vector<std::string> extractNums(const std::string& s)
{
vector<std::string> nums;
bool extracting = false;
auto begin = s.cbegin();
for (auto it = s.cbegin(); it != s.cend(); ++it){
if (extracting){
if (!std::isdigit(*it)){
nums.push_back (std::string(begin, it));
extracting = false;
}
}else{
if (std::isdigit(*it)){
begin = it;
extracting = true;
}
}
}
if (extracting){
nums.push_back (std::string(begin, s.cend ()));
}
return nums;
}