print("\nsınav notlarını hesaplama makinesi!!!\n")
note = input("notunuz nedir?\n")
note = float(note)
if note >= 0 and note < 54:
print("ff")
elif note >= 54 and note <=59:
print("fd")
elif note >= 60 and note <= 69:
print("dd")
elif note >= 70 and note <= 74:
print("cc")
elif note >=75 and note <=79:
print("cb")
elif note >=80 and note <=84:
print("bb")
elif note >=85 and note <=89:
print("ba")
else:
print("aa\naa!!!")