@echo off
setlocal enabledelayedexpansion
cd /d "%~dp0"
for /f "tokens=1-2 delims=," %%a in ('type "a.txt"') do (
    echo %%a---%%b
    for /f "delims=" %%i in ('dir /b /a-d "*.jpg" ^| findstr /i /b "%%a"') do (
        set str=%%~ni
        ren "%%i" "%%b__!str:~0,3!---!str!%%~xi"
    )
)
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