#include<iostream>
#include<string>
using namespace std;
int main()
{
    string s;
    int i,k=0,n;
    cin>>s;
    n=s.size();
    for(i=0;i<=n;i++)
    {if(s.substr(i,5)=="Yardi")
    k=1;}
    if(k==1)
    cout<<"YES";
    else
    cout<<"NO";
    return 0;
}