What is the bug of this Python code?

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Python

code-challenge

the question is this:
Open the max.py file you have in this directory.
You will see two functions: max and main.

In max, the algorithm is written as comments, but there is no code.
You should translate this algorithm to code.

In main, there are three print statements which call max and print
its result. These would let you check if max is working right.

There is also a comment asking you to write one more print statement
with a call to max. In that comment, it asks you to take the max
of two numbers and print them out.
Add a line of code to do this.

What I have tried:

I wrote this code and it works:

# max function to return the larger of two numbers
def max(a, b):
    if a > b:
        return a
    else:
        return b

def main():
    # Printing in the expected format:
    print(f"max(42, -69) is {max(42, -69)}")  # Expected: max(42, -69) is 42
    print(f"max(33, 0) is {max(33, 0)}")      # Expected: max(33, 0) is 33
    print(f"max(0.123, 0.223) is {max(0.123, 0.223)}")  # Expected: max(0.123, 0.223) is 0.223
    print(f"max(-0.123, -0.223) is {max(-0.123, -0.223)}")  # Expected: max(-0.123, -0.223) is -0.123

    # Your custom test case:
    print(f"max(-999, 123) is {max(-999, 123)}")  # Expected: max(-999, 123) is 123

if __name__ == "__main__":
    main()

but i get this error:

max(-999, 123) is 123					      <
Your file did not match the expected output
Testing max(-999, -2147483648) ...
							      >	max(42, -69) is 42
							      >	max(33, 0) is 33
							      >	max(0.123, 0.223) is 0.223
							      >	max(-0.123, -0.223) is -0.123
Your file did not match the expected output
Testing max(-999, 123) ...
							      >	max(42, -69) is 42
							      >	max(33, 0) is 33
							      >	max(0.123, 0.223) is 0.223
							      >	max(-0.123, -0.223) is -0.123
Your file did not match the expected output
Testing max(-999, 567) ...