#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;

int main()
{
    cin>>s;
    if  (s.find("Yardi") != string::npos) cout<<"YES";
    else
        cout<<"N0";

    return 0;
}