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

int main()
{
    char a[101];
    cin.getline(a,100);
    int l=strlen(a),i,ok=0;
    for (i=0;i<l-4 && ok==0;i++)
    {
        if (a[i]=='Y' && a[i+1]=='a' && a[i+2]=='r' && a[i+3]=='d' && a[i+4]=='i')
        {cout<<"YES"; ok=1;}
    }
    if (ok==0)
        cout<<"NO";
    return 0;
}