#include <iostream>
using namespace std;
int main ()
{
double grade ;
cout <<"enter your grade" ;
cin >> grade ;
          if (   (grade>=80) && (grade<100)   )
          {
          cout << "your grade is : " << "A+";
          }
          else if ( (grade>=75)  &&  (grade<80) )
          {
            cout<< "your grade is ; " << "A";
          }            
          else if ( (grade>=70)  &&  (grade<75) )
          {
            cout<< "your grade is ; " << "A-";
          }
          else if ( (grade>=65)  &&  (grade<70) )
          {
            cout<< "your grade is ; " << "B+";
          }
          else if ( (grade>= 60)  &&  (grade<65) )
          {
            cout<< "your grade is ; " << "B";
          }
          else if ( (grade>=55)  &&  (grade<60) )
          {
            cout<< "your grade is ; " <<"B-";
          }
          else if ( (grade>=50)  &&  (grade<55) )
          {
            cout<< "your grade is ; " << "C+";
          }
          else if ( (grade>=45)  &&  (grade<50) )
          {
            cout<< "your grade is ; " << "C";
          }
          else if ( (grade>=40)  &&  (grade<45) )
          {
            cout<< "your grade is ; " << "C-";
          }         
           else if ( (grade>=0)  &&  (grade<40) )
          {
            cout<< "your grade is ; " << "F";
          }
 return 0;
}