letters = ""

backwards = letters[::-1]
print(backwards)

qpo = letters[16:13:-1]
edcba = letters[4::-1]
last8 = letters[:-9:-1]

print(qpo)
print(edcba)
print(last8)


print(letters[-4:])
print(letters[-1:])
print(letters[:1])
print(letters[0])