#include <bits/stdc++.h> ? 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; }