#include <iostream>
#include <cstring>
using namespace std;
char c[105];
int main()
{int i;
cin>>c;
for(i=0;i<=strlen(c)-4;i++)
{
if(c[i]=='Y' && c[i+1]=='a'&& c[i+2]=='r' && c[i+3]=='d' && c[i+4]=='i')
{cout<<"YES";
return 0;
}
}cout<<"NO";
return 0;
}