#Greeting
print("Hi, I am Marvin, your personal bot.")

#Ask the user for a command
command = input("How can I help? ")

#Check for addition command

if command == "add" or command == "plus" or command == "Add" or command == "Plus":
    print("let's add 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)

#Check for subtraction command

elif command == "subtract" or command == "take" or command == "Subtract" or command == "Take":
    print("let's subtract 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)

#Check for division command

elif command == "divide" or command == "Divide":
    print("let's divide 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)

#Check for multiply command

elif command == "multiply" or command == "Multiply" or command == "times" or command == "Times":
    print("let's multiply some numbers")
    input1 = input("Number 1> ")
    input2 = input("Number 2> ")
    number1 = int(input1)
    number2 = int(input2)
    result = number1 * number2
    output = str(result)
    print(input1 + " x " + input2 + " = " + output)


#Check for average command

elif command == "average" or command == "Average":
    print("let's work out an average")
    how_many = input("How many numbers would you like to average?> ")
    how_many = int(how_many)
    total = 0
    for number_count in range(how_many):
        number = input("Enter number " + str(number_count+1) + "> ")
        total = total + int(number)
    result = total / how_many
    print("the average = " +str(result))

#Error handling for unknown commands

else:
    print("Sorry, I don't understand")