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