Code on Python returns Syntax error: "EOL while scanning string literal" at code in bold below:

# function to encode plaintext using Caesar

# shift cipher

def encodePlaintext (plaintext, shiftKey):

ciphertext = ""

shiftNumber = ord(shiftKey) - ord('A')

for plainLetter in plaintext:

index = ((ord(plainLetter) - ord('A')

+ shiftNumber) % 26)

cipherLetter = chr(ord('A') + index)

ciphertext = ciphertext + cipherLetter

return ciphertext

def main():

key = raw_input ('Enter a shift key in uppercase: ')

message = raw_input('Enter a word in uppercase \

to encrypt (# to quit): ')

while message != '#':

secret = encodePlaintext(message, key)

print 'The encrypted word is:', secret

message = raw_input('Enter a word in uppercase \

to encrypt (# to quit): ')

print 'All done'