#include<iostream>
using namespace std;
int main()
{
int num;
cin >> num;
cout << "Letter Grade:" ;
if (num<40){
cout << "Failed";
} else if (num >=40 && num <45){
cout << " C- " ;
} else if (num >=45 && num <50){
cout << "C";
} else if (num >=50 && num <55){
cout << "C+" ;
} else if (num >=55 && num <60){
cout << "B-" ;
} else if (num >=60 && num <65){
cout << "B" ;
} else if (num >=65 && num <70){
cout << "B+" ;
} else if (num >=70 && num <75){
cout << "A-" ;
} else if (num >=75 && num <80){
cout << "A" ;
} else if (num >=80 && num <=100){
cout << "A+" ;
}
}
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