Help me in solving PYTH54 problem

My issue

eventhough I have written the correct answer, it is showing the answer is incorrect

My code

# Update your code below this line

a = int(input(35))
b = int(input(23))
print("Sum is:",add)
print("difference is:", diff)

Learning course: Learn Python
Problem Link: CodeChef: Practical coding for everyone

the d for difference should be in uppercase.