int main()
{
std::vector > vec;
std::ifstream fin("race.in");
int n;
fin >> n;
if (n <= 0)
exit(1);
std::string country;
std::string name;
for (int i = 0; i < n; i++) {
fin >> country >> name;
vec.push_back(std::make_pair(country, name));
}
std::stable_sort(vec.begin(), vec.end(), [](const auto& l, const auto& r) {return l.first < r.first; });
