#include <iostream>
#include <cstring>

using namespace std;

int main()
{
    char s[103];
    int gasit= 0;
    cin >> s;
    int lg= strlen(s);
    for( int i=0; i<lg-4; i++ ) {
        if( s[i]=='Y' && s[i+1]=='a' && s[i+2]=='r' && s[i+3]=='d' && s[i+4]=='i' ) gasit= 1;
    }
    if( gasit == 1 ) cout << "YES";
    else cout << "NO";
    return 0;
}