Consequential with 2 item numbers

Hi

What formula should I used to consequential with a 2 items in a cell?
Let say In column A1.
From AZ129601 to AZ129700 and the next should be AZ129701 to AZ129800, AZ129801 to AZ129900, and so on. There is a 100 item between the item numbers.

I have this code =IF(A1="","",REPLACE(A1,LEN(A1)-1,2,TEXT(RIGHT(A1,2)+1,"00")))
But it is not working the way I wanted with these items.

Thanks.