dizimotong

@echo off&setlocal enabledelayedexpansion

set char=abcdefghijklmnopqrstuvwxyz
set /p str= "请输入英文字母:"
set c1=%str:~0,1%
set c2=%str:~1,1%

for /l %%a in (0,1,25) do (
	set c3=!char:~%%a,1!
	if !c1!==!c3! set start=""
	if defined start set /p= !c3! <nul
	if !c2!==!c3! goto end
	
)
	
:end
pause
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