@echo off
cd /d "%~dp0"
setlocal enabledelayedexpansion
(echo a.jpg
echo b.jpg
echo c.jpg)>"%temp%\1.txt"
(for /f "delims=" %%i in ('dir /b /a-d /od *.jpg') do (
    set /p str=
    ren "%%i" "!str!"
))<"%temp%\1.txt"
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@echo off
cd /d "%~dp0"
setlocal enabledelayedexpansion
set "n=0"
for /f "delims=" %%i in ('dir /b /a-d /od *.jpg') do (
    set /a n+=1
    if !n! equ 1 (
        ren "%%i" "a.jpg"
    ) else if !n! equ 2 (
        ren "%%i" "b.jpg"
    ) else if !n! equ 3 (
        ren "%%i" "c.jpg"
    )
)
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