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@echo off
for %%i in (a b c d e f g h i j k l m n o p q r s t u v w x y z) do set %%i=a
for %%i in (*.*) do (
    if not "%%~nxi"=="%~nx0" (
        set "name=%%~ni"
        setlocal enabledelayedexpansion
        set name1=!name!
        call :lp
        ren "!name!%%~xi" "!nam!%%~xi"
        set "nam="
        endlocal
     )
  )
pause&goto :eof
:lp
if defined name1 (
   set "var=!name1:~,1!"
   if defined !var! set "nam=!nam!!var!"
   set name1=!name1:~1!
   goto lp
)
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