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@echo off
set "MO=ABCDEFGDEADKEFDCFKSEDFASDFGHETYUERTYSDFGHJZXCVBASDFGERSDD"
set /a n=-1
set/p=出现 D 的各个位置: <nul
:LOOP
set /a n=%n%+1 & set /a n1=%n%+2
call set "STR=%%MO:~%n%,1%%"
if defined STR (if "%STR%" == "D" (set/p=%n1% <nul &set /a m=%m%+1)
   goto LOOP)
echo;&echo;
echo 共出现 %m% 次 D
echo;&pause
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