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

int main()
{
    string s;
    while(cin >> s)
    {
        bool found = false;
        for(int i = 0; i < s.length()-4; i++){
            string sub = s.substr(i,5);
            if(sub == "Yardi"){
                found = true;
                break;
            }
        }

        if(found){
            cout << "YES" << endl;
        }else{
            cout << "NO" << endl;
        }
    }

    return 0;
}