yhcfsr

@echo off
set "str=bBAathToHOMmEe"
echo;%str%>%temp%\$
sed "s/[A-Z]//g" %temp%\$
sed "s/[a-z]//g" %temp%\$
del %temp%\$
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@echo off
set "str=bBAathToHOMmEe"

:lp
set "ch=%str:~,1%"
for %%a in (a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,e,s,t,u,v,w,x,y,z) do (
	if "%%a"=="%ch%" (set "LowerCASE=%LowerCASE%%%a") 
)
for %%a in (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) do (
	if "%%a"=="%ch%" (set "UperCASE=%UperCASE%%%a") 
)
set "str=%str:~1%"
if "%str%" neq "" goto :lp
echo;%LowerCASE%%UperCASE%
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