Taurus

試一試...

@echo off&setlocal enabledelayedexpansion&set nub=0
set "s=a b c d e f g h i j k l m n o p q r s t u v w x y z"
set "b=A B C D E F G H I J K L M N O P Q R S T U V W X Y Z"
for %%i in (!s!) do set/a num+=1&set %%i1=%%i
for %%i in (!b!) do set/a num2+=1&set %%i2=%%i
set /p "str=string= *"
:lp
call set str=%%str:~!nub!%%
for %%i in (!b!) do if "!str:~0,1!"=="%%i" call set "OK=!OK!%%!str:~0,1!1%%"&goto ut
for %%i in (!s!) do if "!str:~0,1!"=="%%i" call set "OK=!OK!%%!str:~0,1!2%%"&goto :out
if not "!str!"=="" (set "ok=!ok!!str:~0,1!") else (goto :end)
:out
set nub=1
goto :lp
:end
echo string= *!OK!
pause>nul