#include <bits/stdc++.h>
using namespace std;
int main() {
  int n;
  cin >> n;
  string s;
  cin >> s;
  int x = 0;
  int y = 0;
  for (int i = 0; i < n; i++) {
    if (s.at(i) = 'B') {
      x++;
    } else {
      y++;
    }
  }
  cout << (x < y ? "Yes" : "No") << endl;
}
