dalia

def otp(a, b, mode):
    """one-time pad
   mode=0: encrypt; mode=1: decrypt"""
    a, b = otpformat(a), otpformat(b)
    output = ''
    i = 0
    if mode == 0: sign = 1
    elif mode == 1: sign = -1
    for letter in a:
        output += chr((((ord(letter)-65)
               + (ord(b[i%len(b)])-65)*sign)%26) + 65)
        i += 1
    return output

def otpformat(a):
    a = a.replace(' ','')
    a = a.upper()
    return a

# m='polloesloco'; c='hvcpsjwcgjf'; k = 'IHJEEFEJIHJ'
m='abc'; k='azy'; c = otp(m,k,0)

def makenum(a):
    output = []
    a = otpformat(a)
    for letter in a:
        output.append(ord(letter) - 65)
        print letter,ord(letter) - 65
    return output

def subber(c,m):
    output = []
    for i in range(len(c)):
        j = c[i]-m[i]
        if j < 0:
            j = j+26
        output.append(j)
    return output

m = makenum('polloesloco')
c = makenum('hvcpsjwcgjf')
k = subber(c,m)
print m
print c
print k