#include<stdio.h>
#include<cstring>
#define maxn 105
using namespace std;

int n;
char a[maxn];

int solve()
{
    for(int i=1;i<=n-4;i++)
     if(a[i]=='Y' && a[i+1]=='a' && a[i+2]=='r' && a[i+3]=='d' && a[i+4]=='i')
      return 1;
    return 0;
}

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

    int ok;
    scanf("%s",a+1);
    n=strlen(a+1);
    ok=solve();
    if(ok) printf("YES");
    else printf("NO");

    fclose(stdin);
    fclose(stdout);
    return 0;
}