Call or look up Northrop on the Internet. Find out the terms of acquisition, i.e. how many shares of Northrop for one of Litton.
Here.
http://www.ss.northropgrumman.com/press/news/00_12_21a.html
Looks like you shares are worth either $80.00 per share if common stock or $35.00 per Series B Preferred share.
Northrop Grumman To Acquire Litton Industries For $80 Per Share Cash
Are you rich?
Much easier, simply deposit the shares into a brokerage account. Might have to deal with a mid-level brokerage, but the discounters **may** do the work for you. Stay away from Merrill and Salomon/Citi and that bunch.
The point here is that, if the broker wants you to trade something (a notion of which you should not disabuse him/her), then he or she is going to have to find out just exactly what those shares are worth, now isn't he?
If the shares are printed on a roll of toilet paper, they are not worth much! :>)