lengmoke

@echo off & setlocal EnableDelayedExpansion
md temp
for /f "tokens=1* delims=:" %%i in ('findstr /n .* "a.txt"') do (
    if not "%%j"=="" ( set "str=%%j" & set "strs=!strs! !str: =+!" ) else ( md "temp\!strs!" & set "strs=" )
)
md "temp\!strs!"
for /f "delims=" %%i in (' dir /b/on %cd%\temp ') do (
    for %%j in (%%i) do ( set "str=%%j" & echo !str:+= !)
    echo.
)
rd /q/s temp
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