/*
regex mindcoding round3
*/
#include<vector>
#include<string>
#include<string.h>
#include<algorithm>
#include<cstdio>
#include<fstream>
#include<iostream>
#include<ctime>
#include<set>
#include<map>
#include<cmath>

using namespace std;

#define LL long long;
#define PII pair<int ,int>
#define PCI pair<char ,int>
#define VB vector <bool>
#define VI vector <int>
#define VC vector <char>
#define WI vector<VI>
#define WC vector<VC>
#define RS resize
#define X first
#define Y second

#define FORN(i,n) for(int i=0;i<n;++i)
#define FOR(i,a,b) for(int i=a;i<=b;++i)
#define FORD(i,a,b) for(int i=a;i>=b;--i)
#define REPEAT do
#define UNTIL(x) while((x))

#define IN_FILE "date.in"
#define OUT_FILE "date.out"
ifstream f(IN_FILE);
ofstream g(OUT_FILE);

//variables
string text;
bool ok = true;
//other functions
bool check(char a, int pos)
{
	if (text[pos] == a)
	{
		return true;
	}
	return false;
}
void reading()
{
	cin >> text;
}
void solving()
{
	FORN(i, text.length())
	{
		if (text[i] == 'Y')
		{
			int lit = 0;
			ok = true;
			int aux2 = i;
			char aux = 'Y';
			FOR(j, i, i + 4)
			{
				if (lit == 0)
				{
					aux = 'Y';
				}
				else if (lit == 1)
				{
					aux = 'a';
				}
				else if (lit == 2)
				{
					aux = 'r';
				}
				else if (lit == 3)
				{
					aux = 'd';
				}
				else if (lit == 4)
				{
					aux = 'i';
				}
				if (!check(aux,aux2))
				{
					ok = false;
					break;
				}
				++aux2;
				++lit;
			}
			if (ok)
			{
				return;
			}
		}
	}
}
void write_data()
{
	if (ok)
	{
		cout << "YES";
	}
	else
	{
		cout << "NO";
	}
}
int main()
{
	reading();
	solving();
	write_data();
}