Start with alphabetic filter/sort

Hello ,
I have to achieve a sorting option that allows the user to filter directories based on selected alphabet such as:

A , B, C, D,……. Z

If the user has selected “B” it should list all the directories with titles starting with alphabet “B”

Is it possible to achieve through the options provided in GeoDirectory configuration or is there a work around through code

Attached here is the image which states the desired result to be achieved

Thanks