#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace std;
using namespace __gnu_pbds;
#define int long long
typedef long double ld;
typedef unsigned long long ull;
#define X first
#define Y second
#define mp make_pair
template<class T> using indexed_set = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
template<class T, class X> using indexed_map = tree<T, X, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
const int M = 1e9+7;
const double PI = acos(-1.0);
mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());

int modpow(int n, int k, int MOD);

/**************** code starts here ****************/

void poppingfever() {
	string s; cin >> s;
	int r = 0, b = 0;
	for (char c: s) {
		if (c == 'R') r++; else b++;
	}
	if (r > b) cout << "Yes"; else cout << "No";
}

/**************************************************/

signed main() {
	#ifdef fastfurioustransform
	freopen("inp.txt", "r", stdin);
	freopen("out.txt", "w", stdout);
	#endif
 
	ios::sync_with_stdio(0); cin.tie(0);
	//cout << fixed << setprecision(12);
 
	poppingfever();
 
	return 0;
}

int modpow(int n, int k, int MOD) {
	int ans = 1; n %= MOD;
	while (k > 0) {
		if (k & 1) ans = (ans*n) % MOD;
		k >>= 1; n = (n*n) % MOD;
	}
	return ans; 
}