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

int main(){
	const string primerjava = "Yardi";
	string s;
	cin>>s;

	int index = 0;

	for(int i=0; i<((int)s.size()-(int)primerjava.size()+1); i++){
		/*if(s.substr(i, primerjava.size()).compare(primerjava) == 0){
			cout<<"YES";
			return 0;
		}*/
		for(int x=0; x<(int)primerjava.size(); x++){
			if(s[i+x] == primerjava[index]){
				index++;
			}
			if(index == (int)primerjava.size()){
				cout<<"YES";
				return 0;
			}
		}
	}
	cout<<"NO";

	return 0;
}