# alpha is equal to "abcdefghijklmnopqrstuvwxyz"
rotList = []
for i in range(len(plainText)):
 for j in range(0, 26):
  if plainText[i] in alpha:
   if rotateChar(plainText[i], j) == cipherText[i]:
    rotList.append(alpha[j])
    break
  else:
   rotList.append(plainText[i])
   break