#include <iostream>

using namespace std;

int main(int argc, const char * argv[])
{
    string str;
    cin >> str;
    bool boole = false;
    
    for (int i=0; i+4<str.length(); i++) {
        if (str[i]=='Y'&& str[i+1]=='a'&&str[i+2]=='r'&&str[i+3]=='d'&&str[i+4]=='i') {
            boole = true;
            cout << "YES";
            return 0;
        }
       
    }
    
    if (not boole) {
        cout << "NO";
    }
    return 0;
}