@echo off
cd /d "%~dp0"
for /f "tokens=1-3 delims=.-" %%i in ('dir /b /a-d *.mp4 ^| findstr "\-[0-9]"') do (
    ren "%%i-%%j.%%k" "%%j-%%i.%%k"
    if exist "%%i-%%j.en.srt" (
        ren "%%i-%%j.en.srt" "%%j-%%i.en.srt"
    )
)
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