Trying to categorize using XLOOKUP without spaces in between

I'm trying to organize data by first letter (not alphabetical). The function I'm using right now is IF(LEFT(Sheet1!A1,1) = "L", Sheet!A1,"") I know there has to be an easier way I just don't know what it is.
I'm new to the forum so I don't know how to attach an example. (I clicked attachments and it won't let me) So here's my best at an example

Column 1 Column 2
L5670 124
A550 235
A550 546
L9732 293
L2108 214
L3456 234
A0334 213
A3405 348
L3974 984