Backend workflow with empty list elements

Hi everyone!

Need some thoughts on how to tackle the problem: I have two lists of numbers and some list values might be empty. I need to subtract each list element and put it in the third list. I use backend workflow to iterate through list and update the values, but it seems, that some values are missed and not added (adding default value is list value is empty also doesn’t solve this problem).
Here is an image with test values for better understanding of the problem:
image

Thanks for any inputs!

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