#include<bits/stdc++.h> using namespace std; int main() { double y,s,e,j,p; cin>>y>>s>>e>>j; if((y+s+e+j)/4>=90) { cout<<"#A"; } else if((y+s+e)/3>=80&&j>=90) { cout<<"#B"; } else if(y100||s100||e100||j100) { if(y>=60&&s>=60&&e>=60&&j>=60) { cout<<"#C"; } else cout<<"NO"; } else cout<<"NO"; return 0; }``