#include <iostream>
#include <string>

using namespace std;

int main() {
	int n, r = 0, b = 0;

	string s;
	cin >> n >> s;

	for (int i = 0; i < n; i++) {
		if (s[i] == 'B') b++;
		else r++;
	}

	if(r>b) cout << "Yes";
	else cout << "No";

}