#include <iostream> #include <cmath> using namespace std;
int main() { string s;cin >> s; int t = 0; int l = s.length() - 1; for (int i = 0;i < l;i++) { if (s[i] == s[i+1]) { t = abs(t-1); s.erase(i,2); l -= 2; i -= 2; } } if (t == 0) cout << "NO"; else cout << "YES"; }
