Discussion on: Daily Challenge #191 - Alphabetical Addition

var = input("Enter input: ")
var = list(var)

def addLetters(var):
        if len(var) == 0:
                return 'z';
        else:
                sum = 0
                for i in var:
                        sum += ord(i) - 96

                while sum > ord('z') - 96:
                        sum -= ord('z') -96

                return chr(sum + 96)

print(addLetters(var))