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alphabet = ‘abcdefghijklmnopqrstuvwxyz’
shift = 3
cipher_dict = {alphabet[i]: alphabet[(i+shift)%26] for i in range(len(alphabet))}
plain_text = “Hello,World!”
cipher_text = ”.join(cipher_dict.get(char,char)for char in plain_text.lower())
print(“Plain text:”,plain_text)
print(“Cipher text:”,cipher_text)