#include <stdio.h>
#include <string.h>

using namespace std;

char A[105];
int ok=0;

int main()
{
   // freopen ("in.txt","r",stdin);
   // freopen ("out.txt","w",stdout);

    fgets(A,105,stdin);
    int len=strlen(A);
    for (int i=0;i<len-5;i++)
        if (A[i]='Y' && A[i+1]=='a' && A[i+2]=='r' && A[i+3]=='d' && A[i+4]=='i')
        {
            ok=1;
            break;
        }
    if (ok) printf("YES");
    else printf("NO");

    fclose(stdin);
    fclose(stdout);

    return 0;
}