#include <iostream>
#include <limits.h>
#include <cmath>
#include <string>
#include <stdio.h>
#include <algorithm>
#include <stdlib.h>
#include <vector>
#include <stack>
#include <map>

using namespace std;

string s , q = "Yardi";
int n;
int main()
{
    cin>>s;
    n = s.find("Yardi");
    if (n>=0) cout<<"YES";
    else
        cout<<"NO";

    return 0;
}