#include <bits/stdc++.h>
using namespace std;
int dx[4] = {1, 0, -1, 0};
int dy[4] = {0, 1, 0, -1};
const int long long MOD = 1e9 + 7;
int main() {
  string s;
  cin >> s;
  int r = 0;
  int b = 0;
  for (int i = 0; i < s.size(); i++) {
    if (s[i] == 'R') {
      r++;
    } else {
      b++;
    }
  }
  if (r > b) {
    cout << "Yes" << endl;
  } else {
    cout << "No" << endl;
  }
  return 0;
}
