I have a table that looks like this. I want to click on each folder image in a loop.

In the selector builder I have created a selector that selects the first folder image:
> document table image[Id="ctl00_ContentPlaceHolder1_documentRepeater_ctl00_imgDocument"]
In Google inspector I can see that between rows the only item that changes is the second ct100. In other words, in the next row, it is ct101, etc. I have a loop index %DocsLoopIndex%. I am having (concatenation) trouble replacing the last digit of ct100 with my loop index. I am not worried about more than 9 items