as

#include <iostream>  
using namespace std; 
int main(){ 
int score; 
cin>>score;  
if(scure>=90){ 
cout<<"A"; 
} else if(scure>=80&&a<90){ 
cout<<"B"; 
} else if(scure>=70&&a<80){ 
cout<<"C"; 
}else if(scure>=60&&a<70){ 
cout<<"D"; 
}else if(scure<60){ 
cout<<"E"; } 
}