bot2 program + while

# bot program + while
finished = False
while finished ==False:
    print("Hi, I am Marvin, your personal bot.")
    phrase = input("Whats your name ?  >")
    print(" Morning " + phrase + "  Do you want to add or substract  ?")
    command = input("How can I help ?")
    if command == "add" or command == "plus":
        print("Let's add 3 numbers.")
        input1 = input("Number 1> ")  # input numbers are strings#
        input2 = input("Number 2> ")
        input3 = input("Number 3> ")
        number1 = int(input1)  # use int to convert string to integer#
        number2 = int(input2)
        number3 = int(input3)
        result = number1 + number2 + number3   # by using add #
        output = str(result)  # result of operation#
        print(input1 + " + " + input2 + " + " + input3 + " = " + output)
    elif command == "substract":
        print(" Let's substract some numbers.")
        input1 = input("Number 1> ")
        input2 = input("Number 2> ")
        number1 = int(input1)
        number2 = int(input2)
        result = number1 - number2
        output = str(result)
        print(input1 + " - " + input2+" = " + output)
    elif command == "bye":
        finished = True
    else:
        print("Sorry, I don't understand")