choice = input("Would you like to encode or decode?")
shiftValue = 4

def Encoder():
    secretMsg = input("What message would you like to encode?")
    for char in secretMsg:
        x = ord(char)
        x += shiftValue
        x = chr(x)
        print(x, end="")


def Decoder():
    secretMsg = input("What message would you like to decode?")
    for char in secretMsg:
        x = ord(char)
        x -= shiftValue
        x = chr(x)
        print(x, end="")

def Choose(choice):

    if (choice == "Encode" or "encode"):
        Encoder()
    elif(choice == "Decode" or "decode"):
        Decoder()
    else:
        print("Error: Please input either encode or decode.")

Choose(choice)