懒虫阿布

贴个笨方法，但是顺序不受限制

@echo off
setlocal enabledelayedexpansion

set letterstr=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
echo 请按先后顺序输入两个字母 如：af 
set /p input=
set index=0

for %%i in (%letterstr%) do (
	if /i "%%i"=="%input:~0,1%" (
		set start=!index!
	) 
	if /i "%%i"=="%input:~1,1%" (
		set end=!index!
	) 
	set /a index+=2
)

echo !start!-!end!
if !end! lss !start! (
	set /a len=!start!-!end!+1
	set start=!end!
) else (
	set /a len=!end!-!start!+1
)

call echo %%letterstr:~!start!,!len!%%
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