#include<fstream>
#include<iostream>
#include<string>
#include<map>
#include<cmath>
#include<algorithm>
#include<vector>
#include<list>
#include<set>
#include<cstring>
#include<climits>
#include<deque>
#include<stack>

#define JUDGE

using namespace std;

string S;
string pat = "Yardi";

int main() {
#ifndef JUDGE
	freopen("input.txt", "r", stdin);
#endif
	int i;
	cin >> S;
	if (S.find(pat) != -1) cout << "YES\n";
	else cout << "NO\n";
#ifndef JUDGE
	while (1);
#endif
	return 0;
}