#include <iostream>
#include <cstring>

using namespace std;

int main()
{
    string s;
    string a = "Yardi";

    cin >> s;

    std::size_t found = s.find(a);

    if ( found != string::npos )
            cout << "YES\n";
    else
            cout << "NO\n";

    return 0;
}