Example input:
( (S (NP (NP (VBG Shifting) (NNS goods)) (CC and) (NP (NP (NNS passengers)) (PP (PP (IN from) (NP (NNS roads))) (PP (TO to) (NP (NP (ADJP (RBR less) (JJ polluting)) (NNS forms)) (PP (IN of) (NP (NN transport)))))))) (VP (MD will) (VP (VB be) (NP (NP (DT a) (JJ key) (NN factor)) (PP (IN in) (NP (DT any) (JJ sustainable) (NN transport) (NN policy.))))))) )
Input: