题解

#include<bits/stdc++.h>
using namespace std;
int main(){
int a,b,c;
cin>>a>>b>>c;
if(a>=90){
cout<<"A";
}
else if(a>=80&&a<90){
cout<<"B"<<endl;
}
else if(a>=70&&a<80){
cout<<"C"<<endl;
}
else if(a>=60&&a<70){
cout<<"D"<<endl;
}
else{
cout<<"E"<<endl;
}
}