rat

 
@echo off && setlocal enabledelayedexpansion
call :i l +
call :i r -
set /a r+=1
for /f %%a in (1.txt) do set "v=%%a" && echo !v:~%l%,%r%!>>2.txt
goto :eof
 
:i
set "?=%2"
set "s="
if "%?%"=="+" (set i=0) else (set i=-1)
:repeat
for /f %%a in (1.txt) do set "v=%%a" && set "s=!s!!v:~%i%,1!"
set "v=!v:~%i%,1!"
set "s=!s:%v%=!"
if not defined s (set /a i%?%=1 && goto repeat) else (set %1=%i%)
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