sub F{
	$x=($_=pop)>1;
	/.\d(?{$x+=($`.$'+1,$`.$'=~y!0-9!9!r+1,$`.$'=~y!0-9!0!r)[$&<=>12]})^/g;
	/.*(?=.$)(?{$x+=($t=$`.$')<20?0:$t<30?$&+($t>21):$&=~y!0-9!9!r+1})^/g;
	$x
}
($A,$B)=glob<>;
print-F($A-1)+F($B+0)-$A=~/^(2.*)?2$/