Where do you find alien number on citizenship certificate?

[juliap0000 0]

I'm trying to fill out my N400 form and one of the parts asked if my parents were citizen of U.S.

My mother became citizen (naturalized) around 1990s and when I was filing out the form,

it asked if my mother has A number, which I think it means the alien number you get when you get green card.

But she didn't have it so she sent me a picture of her citizenship certificate, but I have a hard time figuring out which one is the alien number.

I've included a photo that she sent me (I covered the number). I think the A number I'm looking for is the second number I covered, but the problem is that

instead of number being 9 digits, it's 8 digits. So the number is A00-000-000 and I don't know if this is the right one because my A number is 9 digits without A.

If you could please help me I would truly appreciate. Thank you in advance.

[boy15 23]

If your A-Number is fewer than nine digits, insert a zero after the A and before the first digit to create a nine-digit number. For example, A12345678 would become A012345678.

[Beginning777 6]

It's the second number. The one that begins with an A.