How to add an id selector consisting only of numbers?

How to?
#1

I'm trying to get data from a table cell whose id consists of numbers, Web Scraper does not allow me to save such a selector, and reports an error.

How to save such a selector?

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#2

Found this solution for the attribute td[id='168102']

#3

You could do that, but it would only work for that exact ID number. If you want to match by position, something like:

tr.item > td:nth-of-type(4)