Increment value

Hi,
I want to create an incremental name for each text input created dinamically inside a Repeat Children.
For example, I need this format for each text input name, can be any name, var, home, asis, etc., the really important is the incremental number:
var_1
var_2
var_3
var_4


This is ok, but of course the last character should be incremental number, and this keeps in var_3 for each text input.

And this is what I really want, incremental number for each text input name generated with Repeat Children.

Sorry, I can’t figure out how to do that, I’m was checking this post: Increment Value with Button Click, but for me is the same, I can’t figure out how to do it.
Thanks in advance.

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