def encode(plaintext):
    plaintext = str(plaintext)
    cyphertext = ""
    count = 0
    advancedcyphertext = ""
    for l in plaintext:
        cyphertext += str(ord(l)) + " "
        count += 1
        advancedcyphertext += str((ord(l) + count) * 2) + " "
    print "== Encodes to =="
    return "%s" % (advancedcyphertext)

def decode(cyphertext):
    cyphertext = str(cyphertext).strip()
    count = 1
    cypheredtext = []
    cyphered = ""
    cyphertext = list(cyphertext.split(" "))
    for l in cyphertext:
        l = (int(l) / 2) - count
        count += 1
        cypheredtext += [l]
    for n in cypheredtext:
        cyphered += str(chr(int(n)))
    print "== Decodes to =="
    return cyphered

def runscript():
    choice = str(raw_input("Encode or Decode? (e / d): "))
    if choice == "e":
        plaintext = raw_input("Please type a message to encode:\n")
        print encode(plaintext)
        return runscript()
    elif choice == "d":
        plaintext = raw_input("Please type a message to decode:\n")
        print decode(plaintext)
        return runscript()
    else:
        print "Sorry, please input the letter e or d..."
        print
        return runscript()
runscript()