浅默

@echo off
Setlocal Enabledelayedexpansion
set n=0
for /f "delims=" %%i in (a.txt) do (
      set "ke=%%i"
      set ke1=!ke: =!
      set m=0
      call :1                  
)
echo %wang%
pause
goto :eof
:1
  if not "!ke1:~%m%,1!"=="" set /a m+=1&goto 1
  if %m% gtr %n% set n=%m%&set wang=%ke%
  goto :eof