PART 1 1. Using python, create a program with a function of enc_text(text, key) to encrypt the variable text using the provided key (executing a modified version of Ceasar Cipher). Follow these rules: a. The key will contain a word made up of the letters 'a' and 'b'. The cipher will use the key to know the direction of the shift: • 'a' - the character must be shifted upwards • 'b' - the character is to be shifted downward. b. The number of characters in the key will determine the number of positions to shift. c. The given text variable will only have characters from the ASCII table (values between 32 and 126). d. If the key is invalid (contains characters other than a and b or an empty string) or the text is invalid (empty string), no encryption will happen and the function returns the original text. e. The key will loop through again to accommodate the additional text characters if the text has more characters than the key. f. Brute force solutions will not be accepted and an iterative approach should be used to solve this problem. g. The user will enter two strings one after the other: • the first will be the text to encrypt • the second will be the key used to encrypt it h. 0<=len(text)<=1000 0<=len(key)<=1000 len(key) can be greater than len(text) 2. Use the guiding codes below and complete the program. Run the sample inputs below and the codes must get the exact expected output. 3. Take a screenshot of your codes on your python complier and the expected output as well. def enc_text(text, key): encrypted_text ################################################### # place your code here # #################################################### return encrypted_text if_name text = input () key = input() print(enc_text(text, key)) main_": == SAMPLE INPUT 1 SAMPLE INPUT 2 SAMPLE INPUT 3 Hello World abracadabra expelliarmus! abb aa bbb EXPECTED OUTPUT EXPECTED OUTPUT EXPECTED OUTPUT cdtcecfcdtc Kbiol|Zlooa bumbiif^ojrp} PART 2 1. Using python, create a program with a function of dec_text(text, key) to decrypt text applying version of Ceasar Cipher described in PART 1. 2. Use the guiding codes below and complete the program. Run the sample inputs below and the codes must get the exact expected output. 3. Take a screenshot of your codes on your python complier and the expected output as well. def dec_text(encrypted_text, key): decrypted_text #################################################### # place your code here # #################################################### return decrypted_text if text = input () key = input() print(dec_text(text, key)) name main_": 3D SAMPLE INPUT 1 SAMPLE INPUT 2 SAMPLE INPUT 3 Kbiol|Zlooa cdtcecfcdtc bumbiif^ojrp} abb aa bbb EXPECTED OUTPUT EXPECTED OUTPUT EXPECTED OUTPUT Hello World abracadabra expelliarmus!