Code not working

Question

I have completed every course in python3 but now I have to to the challenges, I just want to get it over with, but horrible python can't even do simple math with variables, can't even do 3 lines of code, it just smooshes them together, it doesn't add
If this keeps up, I'm going to quit python.
num1 = input("choose number 1")
num2 = input("choose number 2")
print(num1 + num2)

Answer 1

a, b = input("Sum is: ").split()
print(a+b)

Answer 2

return type of input() function is string ,cast the result to integer
int(input()) to perform addition