#wyodrębnianie napisów
napis = input("")
print(napis[0]) #wyświetla literę o indeksie równym 0
print(napis[3])
print(napis[2], napis[6])
print(napis[2] + napis[6])
print(napis[4] + napis[5] + napis[6] + "a")
print(napis[3:6])
print(napis[0:5])
print(napis[::-1])
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