frankly , it 's pretty stupid . 
(ROOT (S (ADVP (RB frankly)) (, ,) (NP (PRP it)) (VP (VBZ 's) (ADJP (RB pretty) (JJ stupid))) (. .)))
(ROOT (S (ADVP (RB )) (, ) (NP (PRP )) (VP (VBZ ) (ADJP (RB ) (JJ ))) (. )))