#define _CRT_SECURE_NO_WARNINGS
#define _SILENCE_CXX17_C_HEADER_DEPRECATION_WARNING
#include <bits/stdc++.h>
using namespace std;
const int N = 100100;
char str[N];
int main()
{
    scanf("%s", str);
    int len = strlen(str), ans = 0;
    stack<char> S;
    for (int i = 0; i < len; i++)
        if (S.empty() || S.top() != str[i])
            S.push(str[i]);
        else
            S.pop(), ans++;
    puts((ans & 1) ? "Yes" : "No");
    return 0;
}