#include<iostream>
#include<vector>
#include<string>
#include<algorithm>

int main() {
	std::vector<int> v(10, 1);
	int n;
	std::cin >> n;

	for (int i = 0; i < n; i++) {
		int a, b, c, d;
		std::string str;
		std::cin >> a >> b >> c >> d >> str;
		if (str == "NO") {
			v[a] = v[b] = v[c] = v[d] = 0;
		} else {
			v[a]++;
			v[b]++;
			v[c]++;
			v[d]++;
		}
	}
	std::cout << std::find(v.begin(), v.end(), *std::max_element(v.begin(), v.end())) - v.begin() << std::endl;
	return 0;
}