Why shellscript using screencapture -R with variables does not work?

Questions & Suggestions
1

I am trying to figure out why shellscript using screencapture -R with variables does not work?
It works just fine with actual numbers. What is wrong with my syntax?

All the variables derived from the another KBM action that determine LUQ and RLQ coordinates of the mouth and calculate the rectangle size required for screen capture -R.

29%20PM
Screen Shot 2019-01-20 at 12.02.29 PM.jpg1576×704 154 KB

2

This doesn't work because those "Execute Shell Script" actions do not share environmental variables between each other.

Put all of the commands into one "Execute Shell Script" and see if it works.

3

You are completely right!
It works perfectly!

Thank you very much,

bs