Name the neighborhood of the community area in crime with report number 23843?
neighborhood refers to neighborhood_name; '23778' is the report_no
SELECT T3.neighborhood_name FROM Community_Area AS T1 INNER JOIN Crime AS T2 ON T1.community_area_no = T2.community_area_no INNER JOIN Neighborhood AS T3 ON T2.community_area_no = T3.community_area_no WHERE T2.report_no = 23778