blum secure password algorithm

blum.py

import string
import re

alpha = raw_input('alpha: ')
seq = raw_input('seq: ')
name = raw_input('text: ')

seq = map(int, list(seq.replace(" ","")))

f = dict(zip(list(string.ascii_lowercase), map(int, list(alpha.replace(" ","")))))
g = lambda n: seq[(n + 1) % 10]

cipher = map(f.get, re.sub(r'[^a-z]', "",name))

b = (cipher[0] + cipher[len(cipher)-1]) % 10
print reduce(lambda x,y: x + [g(x[len(x) -1] +y) % 10], cipher[1::], [b])