Generate a topic word for the given sentence. A topic word is usually the name of a person, place, animal, concept or object the sentence is focusing on.

songkran is a festival held every year in thailand on april 13.
songkran

tatsuya shiji (志治 達雄, shiji tatsuya, born october 20, 1938) is a former japanese football player.
tatsuya shiji

wuthering heights is a novel by emily brontë.

wuthering heights