message=""
def printDecrypt(msg):
    print("Decrypted message: ", end="")
    for i in msg:
        print(i, end="")

def printEncrypt(encrypt):
    print("Encrypted message: ", end="")
    for i in encrypt:
        print(i, end="")

def encryptMessage():
    message = list(input("Message for encrypting: "))
    loopCount = 0
    for i in range(len(message)):
        if loopCount % 10 == 0:
            loopCount = int(round(loopCount / 10, 0))
        message[i] = chr(ord(message[i]) + loopCount)
        loopCount += 1
    printEncrypt(message)

def decryptMessage():
    message = list(input("Message for decrypting: "))
    loopCountDecrypt=0
    for i in range(len(message)):
        if loopCountDecrypt%10==0:
            loopCountDecrypt = int(round(loopCountDecrypt/10, 0))
        message[i] = chr(ord(message[i])-loopCountDecrypt)
        loopCountDecrypt+=1
    printDecrypt(message)

doWhat=""
while doWhat != "exit":
    doWhat = input("Decrypt or encrypt message?: ")
    doWhat.lower()
    if doWhat == "encrypt":
        encryptMessage()
    elif doWhat == "decrypt":
        decryptMessage()
    else:
        if doWhat != "exit":
            print("type encrypt to encrypt a message, type decrypt to decrypt a message, type exit to exit the program")