#include <iostream>
#include<string.h>
#include <stdio.h>
using namespace std;

    
    int main(){
		
      char s[256],t[256];
	  gets(s);
	  for(int i=0;i<strlen(s);i++)
	  t[i]=putchar (tolower(s[i]));
	  
	  if(strstr(t,"yardi"))
		  cout<<"YES";
	  else cout<<"NO";
    }