They had to let waist-high of attention .
(ROOT_0 (S_0 (ATS_3 (NP_1 (PRP_0 They)) (VP_4 (VBD_2 had) (S_2 (VP_0 (TO_0 to) (VP_1 (VB_0 let) (ADJP_0 (JJ_1 waist-high) (PP_1 (IN_1 of) (NP_2 (NN_3 attention))))))))) (DOT_0 .)))