1. always use the spoiler flag when posting code / solutions (I have added the flag to your comment) otherwise anyone can see it
2. I suggest you make a habit of reading your error feeback very carefully:

should return "Odd" for odd positive numbers
Expected
    <string>: odd
to equal
    <string>: Odd

Bugged user.

And who says they are? Can you explain what the problem is exactly?

Your solution causes following error:

Incorrect answer for number=-21
Expected: equal to "Odd"
Actual: "Even"

Your solution incorrectly returns "Even" for n=-21.

Bugged kata, -21 and -977 are not even.

Found it in the below comments

how to do the test any coding. whatever i type it shows error

Maybe mb but I didn't read the solution setup, as it was written awkwardly.
No intent updating the Details?

Hardest Kata ever (in BF)

very nice problem!

thanks mane u really helped my morale here

Ugh, I thought it would be more difficult. If you are stuck, catch my support!

Returning 0, as per stated in the description, involves 2 conditions:

• being a valid sequence (numerical values only)
• having NO missing numbers

As I said before, an empty sequence is either considered:

• valid AND missing some numbers (starting with 1) -> so it should return the missing number
  OR
• not valid (having no numerical values at all) -> so it should return 1

An empty sequence doesn't satisfy both conditions for returning 0.
And 1 is the missing number because as stated in the descritpion:
"Check if the elements are part of an ascending sequence of integers starting with 1".

an empty sequence is valid but missing 1
In both cases, the return value should be 1, not 0.

If the sequence is valid, the return value should be 0, not some missing value:

"1 2 3 4" -> 0  (not 5)
"1"       -> 0  (not 2)
""        -> 0  (not 1)

Thanks, I passed!