ieutk

@echo off
setlocal enabledelayedexpansion
set /a num=-1
:main
set "ot="
set /a num+=1
for /f "delims=" %%a in (a.txt) do call :ie "%%a"
echo.%ot%
goto :main


:ie
set "var=%~1"
if "!var:~%num%,1!"=="" (pause&exit)
call,set "ot=!ot!%%var:~%num%,1%%"
goto :eof
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