bool check_str_to_int(string str) {
  for (int i = 0; i < str.length(); i++) {
    if (!isdigit(str.at(i))) return false;
  }

  return true;
}

void table::imprt(string note) {
    string shop, name, cost_str;
    int cost;
    ifstream in(note);
    if (in.is_open()) {
        while (!in.eof()) {
            in >> shop;
            in >> name;
            in >> cost_str;
            if (check_str_to_int(cost_str)) {
              add(shop, name, stoi(cost_str));
            } else {
              cout << "Ошибка чтения (" << cost_str << ")" << endl;
            }

        }
        del(shop, name);
    }
    else {
        cout << "File not Found: " << note << "\n";
    }
    in.close();
}