[Python] Keep getting error code - TypeError: unsupported operand type(s) for -: 'int' and...

Im trying to make a program that always produces the sum of two three-digit numbers, derived from the difference of two other three-digit numbers, as 1089, provided that the originally chosen number’s first and third digits differ by two or more. I will clarify that i am very new to this and only know the very basics. This is what i have so far.

num1 = input("Choose a three digit number whose first and third digits vary by at least two numbers.")

num2 = num1[2] + num1[1] + num1[0]

if int(num1) < int(num2):

difference = int(num2) - (num1)
else:

difference = int(num1) - (num2)

newNum1 = str(difference)

newNum2 = newNum1[2] + newNum1[1] + newNum1[0]

ten89 = int(newNum1) + int(newNum2)

print ("If you chose your three-digit number correctly your should have gotten 1089 and you got," ,ten89)


I keep getting the error code -

TypeError: unsupported operand type(s) for -: 'int' and 'str' - for the line - difference = int(num2) - (num1).

I tried changing the int in that line to str, as well as others. If anyone could tell me where I'm going wrong I'd really appreciate it. Thanks!

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