simple python2 code for decrypting mono alphabetic cipher

monoAlphabeticCipher

#!/usr/bin/python 
#Mono Alphabetic Cipher with user defined key

from collections import OrderedDict

LETTERS = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'
KEYPHRASE = '' 

def makeKeyphrase(key):
    ##remove repeated alphabets 
    KEYPHRASE = "".join(OrderedDict.fromkeys(key))
    ##make keyphrase
    lastInd = LETTERS.find(KEYPHRASE[len(KEYPHRASE)-1])
    subletter = LETTERS[lastInd:len(LETTERS)]
    proletter = LETTERS[0:lastInd]

    KEYPHRASE += ''.join( c for c in subletter if c not in KEYPHRASE)
    KEYPHRASE += ''.join( c for c in proletter if c not in KEYPHRASE)

    print('key phrase: ' + KEYPHRASE)
    print('letters:    ' + LETTERS)

def decryptMessage(message):
    translated = ''

    ## something wrong with using symbol in find() method?
    for symbol in message:
        symIndex = KEYPHRASE.find(symbol[0])
        translated += LETTERS[symIndex]

    print(translated)

def main():
    message = raw_input("message to crack: ")
    key = raw_input("key used to cipher: ")
    
    makeKeyphrase(key)
    #decryptMessage(message)



main()