2.13 Bot add or subtract

print ("Hi, I am Marvin, your personal bot")
command = input ("How can I help?")
if command == "add":
  print ("lets 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)
elif command == "subtract":
  print ("lets subtract some numbers")
  input1 = input ("Number1>")
  input2 = input ("Number2>")
  number1 = int(input1)
  number2 = int(input2)
  result = number1 - number2
  output = str(result)
  print(input1 + " - " + input2 + " = " + output)
else:
  print ("I don't understand")