Overpass query to get the id of country boundaries

I am trying to get the ids of the closed boundaries of all countries (one relation id for each country).
Until now, I have this overpass query:

out ids;

However, there are some “boundary” relation sections in some countries (France, Germany, Spain) that are affecting the list (relation ids: 102666, 51239, 90333, 90340, etc.).

How can I identify the relation for each country? I have also tried the isClosed function, but probably I didn’t use correctly.

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