77七

@echo off
set fa=a
set fb=b
cd /d "%~dp0"
setlocal enabledelayedexpansion
for %%a in ("%fa%\*") do (
	set /a n+=1
	set #!n!=%%~nxa
)
for /f "delims=" %%a in ('dir /b /a-d "%fb%\*"') do (
	set /a m+=1
	call ren "%fb%\%%a" "%%#!m!%%"
)
endlocal
pause
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