What is the {Vostok} for {astronaut mission} of {Yuri Gagarin}
What Vostok mission did Yuri Gagarin fly in?
 select distinct ?obj where { wd:Q7327 wdt:P450 ?obj . ?obj wdt:P31 wd:Q624038 } 
select distinct ?obj where { ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q7327> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P450> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?obj . ?obj <http://www.wikidata.org/entity/P31> <http://wikidata.dbpedia.org/resource/Q624038> } 
What was Yuri Gagarin's mission in Vostok?