#include <iostream> using namespace std; int main(){ int a; cin>>a; switch(a/10){ case 10:cout<<"A"<<endl;break; case 9:cout<<"A"<<endl;break; case 8:cout<<"B"<<endl;break; case 7:cout<<"C"<<endl;break; case 6:cout<<"D"<<endl;break; default: cout<<"E"<<endl;break; } }