String replace at end index

HI, I’m sure I’ve asked this before but sorry I cant find it.

How do I insert at the end of a string so it dosn’t matter if its A2000 or A200. It will insert at the end

A200, 201, 202, - A211, A212, A213
A2000, 2001, 2002, - A2011, A2012, A2013

Replace item at index is wrong but all i can think of at the moment. Trying to get the sequenced string inserted into the other.

image

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there are many solutions to this
here is one:

Sorry I think ive miscommunicated. I’d like to combine the two lists in my graph picture to achieve

0 A200
1 A201
2 A202
continued to show the second value from the end being replaced
11 A211
12 A212
13 A213

But if the A200 changed to A2000 It would still achieve

0 A2000
1 A2001
2 A2002
continued to show the second value from the end being replaced
11 A2011
12 A2012
13 A2013

Something like this?
Changing “A200” to “A2000” etc is possible.

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Thank you!