no such thing is a big letdown . 
(ROOT (S (NP (DT no) (JJ such) (NN thing)) (VP (VBZ is) (NP (DT a) (JJ big) (NN letdown))) (. .)))
(ROOT (S (NP (DT ) (JJ ) (NN )) (VP (VBZ ) (NP (DT ) (JJ ) (NN ))) (. )))