terse

@echo off&setlocal enabledelayedexpansion
for /f "delims=" %%i in (a.txt) do set str=%%i&set/a n+=1,m=0&call:lp
   for /l %%i in (0 1 %m%) do if not "!%%ip!"=="" echo !%%ip!
pause&goto :eof
:lp
   set "%m%p=!%m%p!!str:~%m%,1!"
   if not "!str:~%m%,1!"=="" set/a m+=1&goto lp
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terse

行的字符不同处理

@echo off&setlocal enabledelayedexpansion
set t=0
for /f "delims=" %%i in (a.txt) do set str=%%i&set/a n+=1,m=1&call:lp
   for /l %%i in (1 1 %t%) do (
      for /l %%j in (1 1 %n%) do if "!%%jp%%i!"=="" (set/p= <nul)else set/p=!%%jp%%i!<nul
      echo.
)
pause&goto :eof
:lp
   set "%n%p%m%=%str:~,1%"
   set "str=%str:~1%"
   if defined str set/a m+=1&goto lp
   if %m% gtr %t% set/a t=m
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