How to generate random password using batch file

@echo off
color 0a
:Start
cls
title Password Generator
echo.
echo.
echo.
echo.
echo ÉÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍ»
echo º                Password Generator Utility            º
echo ÈÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍͼ
echo.
echo.
ECHO      Please wait while system starts.
ping -n 3 -w 3000 0.0.0.1 > nul
echo.
echo.
echo.
echo.
echo I will generate a password for you.Please copy the password.
echo ÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍ
echo.
echo Input your choice
echo.
echo 1 Input password length.
echo 2 Go To back menu.
echo 3 Exit.
echo.
set input=
set /p input= Choice:
if %input%==1 goto A if NOT goto Start
if %input%==2 goto start if NOT goto Start
if %input%==3 goto b if NOT goto Start

:A

set /P lengthnumberuser="What length do you want your password to be?   "

cls
Setlocal EnableDelayedExpansion
Set _RNDLength=%lengthnumberuser%
Set _Alphanumeric=ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789
Set _Str=%_Alphanumeric%987654321

:_LenLoop
IF NOT "%_Str:~18%"=="" SET _Str=%_Str:~9%& SET /A _Len+=9& GOTO :_LenLoop
SET _tmp=%_Str:~9,1%
SET /A _Len=_Len+_tmp
Set _count=0
SET _RndAlphaNum=

:_loop
Set /a _count+=1
SET _RND=%Random%
Set /A _RND=_RND%%%_Len%
SET _RndAlphaNum=!_RndAlphaNum!!_Alphanumeric:~%_RND%,1!
If !_count! lss %_RNDLength% goto _loop
echo.
echo.
echo.
echo.
echo ÉÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍ»
echo º                Password Generator Utility            º
echo ÈÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍͼ
echo.
echo.
ECHO      Please wait while system starts.
ping -n 3 -w 1000 0.0.0.1 > nul
echo.
echo.
echo.
echo.
echo.
echo.
echo.
Echo Password is: is !_RndAlphaNum!
echo.
echo.
echo.
echo.
echo.
echo.
pause
goto start
:B
:Exit
exit

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