set /a a=0,b=0,c=0,d=1 & del out.txt 2> nul
for /f "delims=:" %%i in ('findstr /n . in.txt') do set /a a=%%i
for /f "delims=:" %%i in ('findstr /n hoge in.txt') do set /a b=%%i
if %a%==%b% set /a c=b
for /f "delims=0123456789 tokens=*" %%i in ('findstr /n .* in.txt') do (
set "e=%%i"
setlocal enabledelayedexpansion
if !d!==!c! goto x
echo.!e:~1!>>out.txt
endlocal
set /a d+=1
)
:x
echo hoge>>out.txt