#include <iostream>
#include <string>
#include <cstdio>
using namespace std;

string a, b = "Yardi";

int main() {
    //freopen("a.in", "r", stdin);
    cin >> a;

    if (a.find(b) != string::npos)
        cout << "YES\n";
    else
        cout << "NO\n";
    return 0;
}