#include<cstdio>
#include<cstring>
using namespace std;
int n,i; char s[1005];
int main()
{
	//freopen("test.in","r",stdin);
	//freopen("test.out","w",stdout);
    scanf("%s",s+1); n=strlen(s+1);
    for(i=1;i<=n-4;i++)
        if(s[i]=='Y' && s[i+1]=='a' && s[i+2]=='r' && s[i+3]=='d' && s[i+4]=='i')
        {
            printf("YES\n");
            return 0;
        }
    printf("NO\n");
	return 0;
}