Firebase with AppendValue

Hi, maybe that an easy one but i don't see how to do to get back the data i've stored using AppendValue call.
I have to store multiple records for one same TAG. Then i choosed the Append method which
I red that it could only run with list data.
Then, for example, i did this trial :
I stored 3 times, datas are well stored in Firebase

How can i get it back ?
(in my exemple :TAG RCS123123124, Record 1: 'Cheval', 'Chien', 'Merle' / Record 2 Cheval, Chien, M

You will need to get the value for the tag RCS123123124, and then work on your complicated list of lists in the app.

Thks it's help me a lot ....