Hey Yevgeny,
Good job on figuring out the AppleScript! 
In future please use proper code-blocks for AppleScript and any other code.
See this thread for the basics:
Code Block Fencing on the Keyboard Maestro Forum and Paste AppleScript as Markdown Macro
I've adjusted the post above for you already.
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Best Regards,
Christopher Stone (Keyboard Maestro Moderator)