#include <iostream>
#include <cstring>
using namespace std;

int ok (char s[101],int i)
{
    if (s[i]=='Y' && s[i+1]=='a' && s[i+2]=='r' && s[i+3]=='d' && s[i+4]=='i')
        return 1;
    return 0;
}

int main()
{
    char s[101];
    cin.getline(s,101);
    int l=strlen(s),inter=0;
    for (int i=0;i<l-4 && inter==0;i++)
        if (ok(s,i))
            inter=1;
    if (inter==1)
        cout<<"YES";
    else
        cout<<"NO";
    return 0;
}