qnli question: Who wrote the movie Stella in 1955? sentence: Notable films were Η κάλπικη λίρα (1955 directed by Giorgos Tzavellas), Πικρό Ψωμί (1951, directed by Grigoris Grigoriou), O Drakos (1956 directed by Nikos Koundouros), Stella (1955 directed by Cacoyannis and written by Kampanellis).