545810831

@echo off&setlocal enabledelayedexpansion
for /f "delims=" %%i in ('dir /b a\*.txt') do (
set n=10000
for /f "usebackq delims=" %%a in ("%%~dpia\%%~nxi") do (
set /a n+=1
echo !n:~-4!  %%a>>new%%~nxi
)
)
pause
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