wxcute

@echo off
setlocal enabledelayedexpansion
call :loop n-1 fx
call :loop -n lx
set/a fx=fx,lx=lx+1
for /f "delims=" %%i in (1.txt) do (
     set "var=%%i"
     echo !var:~%fx%,%lx%!
)
pause
goto :eof
:loop
set/a n+=1
set/a m=%1
for /f "delims=" %%a in (1.txt) do (
     set "var=%%a"
     if not "!str!"=="" if not "!str:~%m%,1!"=="!var:~%m%,1!" set "%2=%m%"
     set "str=%%a"
)
if not defined %2 goto loop
set n=
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