#include <iostream>
#include <string>

using namespace std;

string s;

int main()
{
    cin  >> s;
    bool ok = false;
    for (int i = 0; i < s.size(); i++) {
        if (s[i] == 'Y' && s[i + 1] == 'a' && s[i + 2] == 'r' && s[i + 3] == 'd' && s[i + 4] == 'i') {
            ok = true;
            break;
        }
    }

    if (ok == true) {
        cout << "YES\n";
    } else {
        cout << "NO\n";
    }

    return 0;
}