def encrypt(message, key):

"""

Takes a string and an integer an returns the encrypted message using the Caesar cipher method

>>> encrypt("Hello world",12)

'Tqxxa iadxp'

>>> encrypt("We are Penn State!!!",6)

'Ck gxk Vktt Yzgzk!!!'

>>> encrypt("We are Penn State!!!",5)

'Bj fwj Ujss Xyfyj!!!'

>>> encrypt(5.6,3)

'Invalid input'

>>> encrypt('Hello',3.5)

'Invalid input'

>>> encrypt(5.6,3.15)

'Invalid input'

"""

# --- YOU CODE STARTS HERE

# --- CODE ENDS HERE

def decrypt(message, key):

"""

Takes a string and an integer an returns the decrypted message using the Caesar cipher method

>>> decrypt("Tqxxa iadxp",12)

'Hello world'

>>> decrypt("Ck gxk Vktt Yzgzk!!!",6)

'We are Penn State!!!'

>>> decrypt("Bj fwj Ujss Xyfyj!!!",5)

'We are Penn State!!!'

>>> decrypt(5.6,3)

'Invalid input'

>>> decrypt('Hello',3.5)

'Invalid input'

>>> decrypt(5.6,3.15)

'Invalid input'

"""

# --- YOU CODE STARTS HERE

# --- CODE ENDS HERE