路过

@echo off&setlocal enabledelayedexpansion
set w=0&set "e="

for /f "tokens=*" %%i in (a.txt) do (set q=%%i
  call :m !q: =!
  set/a r=w-l
if "!r:~0,1!"=="-" (set w=!l!&set e=%%i))
echo;%e%
pause&exit

:m
set m=%1&set l=0
for /l %%i in (0,1,1024) do (if "!m:~%%i,1!"=="" (set/a l=%%i-1&goto :eof))
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