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import socket

def decrypt_message(ciphertext, shift=3):
    plaintext = ""
        for char in ciphertext:
                if char.isalpha():
                            shifted = ord(char) - shift
                                        if char.islower():
                                                        if shifted < ord('a'):
                                                                            shifted += 26
                                                                                        else:
                                                                                                        if shifted < ord('A'):
                                                                                                                            shifted += 26
                                                                                                                                        plaintext += chr(shifted)
                                                                                                                                                else:
                                                                                                                                                            plaintext += char
                                                                                                                                                                return plaintext

                                                                                                                                                                def start_server():
                                                                                                                                                                    server_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
                                                                                                                                                                        host = "127.0.0.1"
                                                                                                                                                                            port = 12345