#include <iostream>
using namespace std;
int main() {
int n, first, x;
cin>>n>>first;
int min=first, max=first;
for(int i=1;i<n;i++){
cin>>x;
if(x<min)
min=x;
else if(x>max)
max=x;
}
if(first==min)
cout<<"ez";
else if(first==max)
cout<<"hard";
else
cout<<"?";
return 0;
}
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