grade = float(raw_input("Enter your score: "))

if 90<grade and grade<=100:
    print str(grade) + " is excellent!"
elif 80<grade and grade<=90:
    print str(grade) + " is very good."
elif 65<grade and grade<=80:
    print str(grade) + " is average."
elif 50<grade and grade<=65:
    print str(grade) + " needs improvement."
elif 0<=grade and grade<=50:
    print str(grade) + " is not so good."
else:
    print "Sorry, " + str(grade) + " is out of range."