How many people have coached the players of Middlesbrough FC?
SELECT DISTINCT COUNT(?uri) WHERE { ?x <http://dbpedia.org/ontology/team> <http://dbpedia.org/resource/Middlesbrough_F.C.> . ?x <http://dbpedia.org/ontology/manager> ?uri  . ?uri <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/Person>}
Middlesbrough_F.C.