def decrypt(message): result = "" for char in message: if char.isalpha(): if char.islower(): new_char = chr((ord(char) - ord('a') - 5 + 26) % 26 + ord('a')) else: new_char = chr((ord(char) - ord('A') - 5 + 26) % 26 + ord('A')) result += new_char else: result += char return result message = input("请输入密文：") print(decrypt(message))