#include <iostream> //designed by hu 2025-10 using namespace std; int main(){ int g; //grade --- 首字母 cin>>g; //从键盘输入 g=90; if( g>=90 ){ cout<<"A"; } else if( g>=80) { //80-89 cout << "B"; } else if( g>=70 ){ // 70-79 cout << "C"; } else if( g>=60 ){ // 60-69 cout << "D"; } else{ cout << "E"; } return 0; }