digital

def encode(message, key):
    unsalted = [ (ord(x) - 96) for x in message ]
    if len(unsalted) > len(str(key)):
        keysize = len(unsalted)//len(str(key)) + len(unsalted)%len(str(key))
        keylist = list(str(key)*keysize)
    salted = [ int(l) + int(s) for l,s in zip(unsalted,keylist)]
    return salted