import sys
import os
word=[]
word1=[]
alphabet= {1:'a', 2:'b' , 3:'c' , 4:'d' , 5:'e' , 6:'f' , 7:'g' , 8:'h' , 9:'i' , 10:'j' , 11:'k' , 12:'l' , 13:'m' , 14:'n' , 15:'o' , 16:'p' , 17:'q' , 18:'r' , 19:'s' , 20:'t' , 21:'u' , 22:'v' , 23:'w' , 24:'x' , 25:'y' , 26:'z'}
numbers= {'a':1 , 'b':2 , 'c':3 , 'd':4 , 'e':5 , 'f':6 , 'g':7 , 'h':8 , 'i':9 , 'j':10 , 'k':11 , 'l':12 , 'm':13 , 'n':14 , 'o':15 , 'p':16 , 'q':17 , 'r':18 , 's':19 , 't':20 , 'u':21 , 'v':22 , 'w':23 , 'x':24 , 'y':25 , 'z':26}
a=""

def sclear():
	sys.stdout.write(os.popen('clear').read())

def encrypt(alphabet,numbers):
	string1=raw_input('Enter your string:      ')
	length=len(string1)
	for num in range(length):
	  newstring=3+numbers[string1[num]]
          word.append(alphabet[newstring])
	  encrypted="".join(word)
	print "The encrypted text is:		%s" % encrypted

def decrypt(alphabet,numbers):
	string1=raw_input('Enter your string:	   ')
	key=raw_input('Enter the key:	   ')
	length=len(string1)
	for num in range(length):
	  b="%s-%s" %  (numbers[string1[num]],key)
	  a=numbers[string1[num]]
	  print a
	  print alphabet[a]
	  print b
	  word1.append(alphabet[newstring])
	  decrypted="".join(word1)

	print "The decrypted text is:		%s" % decrypted

def arg1():
  action=raw_input('Do you want to encrypt or decrypt(e,d):')

  if action == "e":
    encrypt(alphabet,numbers)
  elif action == "d":
    decrypt(alphabet,numbers)
  elif action != "e"|"d":
    arg1()
sclear()
arg1()
print "Done";