#include <cstdio>
#include <cstring>
#include <cstdlib>
using namespace std;
char p[10]={"Yardi"};
char v[101];
int main()
{
    //freopen("in","r",stdin);
    //freopen("out","w",stdout);
    scanf("%s",v);
    int i,n=strlen(v),ok,j;
    for(i=0;i<=n-5;i++)
    {
        ok=0;
        for(j=0;j<5;j++)
        {
            if(p[j]!=v[j+i]) {ok=1;break;}
        }
        if(ok==0)
        {
            printf("YES");
            exit(0);
        }
        i+=j;
    }
    printf("NO");
}