#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef long double ld;
#define X first
#define Y second
#define pb push_back

int main() {
	ios_base::sync_with_stdio(0), cin.tie(0);
	string s;
	cin >> s;
	ll cnt = 0;
	stack<char> st;
	for (ll i = 0; i < s.size(); ++i) {
		if (st.empty()) {
			st.push(s[i]);
			continue;
		}
		if (st.top() != s[i]) {
			st.push(s[i]);
			continue;
		}
		st.pop();
		++cnt;
	}
	if (cnt % 2 == 0) cout << "No\n";
	else cout << "Yes\n";
	return 0;
}