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