#Read in a percentage and output the associated letter grade

percent = float(raw_input("Enter the percentage grade: "))

if (percent < 0 or percent > 100):
    print "Please enter a value between 0 and 100."
elif percent >= 85:
    print "The student earned an A."
elif percent >= 75:
    print "The student earned a B."
elif percent >= 65:
    print "The student earned a C."
elif percent >= 55:
    print "The student earned a D."
else:
    print "The studnet earned an F."