# include<iostream> using namespace std; int main(){ int s; cin>>s; if(s>=90){ cout<<"A"<<endl; } else if(s>=80&&s<90){ cout<<"B"<<endl; } else if(s>=70&&s<80){ cout<<"C"<<endl; } else if(s>=60&&s<70){ cout<<"D"<<endl; } else{ cout<<"E"<<endl; } return 0; }