disable "-" indicator of previous window in flags?

I have the following line in my .screenrc :

hardstatus alwayslastline "%-Lw%{+r}%50>%n%f %t%{-}%+Lw"

where %w means all window numbers and names
and the window flags if 'L' is given. 

So my hardstatus line looks for example like this:

1$ irc  2!$ jab  3-$ mail  4$ news  5$ www


One of the possible flags is - which means the previous window I was in.
I want to disable displaying that flag, because it is useless for me,
and it bothers me it is there, I just don't like to see on the screen
things that I don't need, it distracts me. 

How can I get rid of it?
I want to leave display of other flags, like ! or @ enabled, these are
useful. 

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