find Specific letters in batch file

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Windows

file

batch

i want batch file search in file if have small english letters and numbers only it will send him to fin and if he have symbol different than small english letters and numbers it will send him to end

for example:

set /p test=enter password
echo %test%>123.txt
findstr /m "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,1,2,3,4,5,6,7,8,9,0"
if %errorlevel%==0 goto fin
if %errorlevel%==1 goto end
:fin
echo your password have small english letters and numbers
pause
exit
:end
echo your password have symbol different than small english letters and numbers
pause
exit