Question: Who wrote the French drama film that opened the 1959 Cannes Film Festival?

Documents:
source: The 400 Blows
text: The 400 Blows The 400 Blows (French: "Les Quatre Cents Coups" ) is a 1959 French drama film, the debut by director François Truffaut; it stars Jean-Pierre Léaud, Albert Rémy, and Claire Maurier. One of the defining films of the French New Wave, it displays many of the characteristic traits of the movement. Written by Truffaut and Marcel Moussy, the film is about Antoine Doinel, a misunderstood adolescent in Paris who struggles with his parents and teachers due to his rebellious behavior. Filmed on location in Paris and Honfleur, it is the first in a series of five films in which Léaud plays the semi-autobiographical character.

source: 1959 Cannes Film Festival
text: 1959 Cannes Film Festival The 12th Cannes Film Festival was held from 30 April to 15 May 1959. The Palme d'Or went to the "Orfeu Negro" by Marcel Camus. The festival opened with "Les Quatre Cents Coups", directed by François Truffaut and closed with "The Diary of Anne Frank", directed by George Stevens.

source: Édes Anna
text: Édes Anna Édes Anna is a 1958 Hungarian drama film directed by Zoltán Fábri. It was entered into the 1959 Cannes Film Festival.

source: L'Amant double
text: L'Amant double L'Amant double (literally "the double lover", and titled Amant Double for English audiences at the Cannes Film Festival) is a 2017 French drama film directed by François Ozon. It was selected to compete for the Palme d'Or in the main competition section at the 2017 Cannes Film Festival.

source: Middle of the Night
text: Middle of the Night Middle of the Night is a 1959 American drama film directed by Delbert Mann, and released by Columbia Pictures. It was entered into the 1959 Cannes Film Festival. It stars Fredric March and Kim Novak. The screenplay was adapted by Paddy Chayefsky from his Broadway play of the same name.

source: Court Martial (1959 film)
text: Court Martial (1959 film) Court Martial (German: Kriegsgericht ) is a 1959 West German drama film directed by Kurt Meisel. It was entered into the 1959 Cannes Film Festival.

source: A Home for Tanya
text: A Home for Tanya A Home for Tanya (Russian: Отчий дом , translit. Otchiy dom) is a 1959 Soviet drama film directed by Lev Kulidzhanov. It competed for the Palme d'Or at the 1959 Cannes Film Festival.

source: Bloody Twilight
text: Bloody Twilight Bloody Twilight (Greek: Matomeno iliovasilemma ) is a 1959 Greek drama film directed by Andreas Labrinos. It was entered into the 1959 Cannes Film Festival.

source: Rolf Thiele
text: Rolf Thiele Rolf Thiele (7 March 1918 – 9 October 1994) was a German film director, producer and screenwriter. He directed 42 films between 1951 and 1977. He was born in Budweis, then in the Austro-Hungarian Empire. His 1958 film "Eva" was entered into the 1959 Cannes Film Festival. His 1964 film "Tonio Kröger" was entered into the 14th Berlin International Film Festival.

source: Lajwanti
text: Lajwanti Lajwanti is a 1958 Indian drama film directed by Narendra Suri. It was entered into the 1959 Cannes Film Festival, where it was nominated for the Palme d'Or for Best Film.

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Answer: Truffaut and Marcel Moussy