Task: Question Understanding
Input (English): Passage: While The Oxford Encyclopedia of British Literature states that modernism ended by c. 1939 with regard to British and American literature, "When (if) Modernism petered out and postmodernism began has been contested almost as hotly as when the transition from Victorianism to Modernism occurred."  Clement Greenberg sees modernism ending in the 1930s, with the exception of the visual and performing arts, but with regard to music, Paul Griffiths (writer) notes that, while Modernism "seemed to be a spent force" by the late 1920s, after World War II, "a new generation of composers-Pierre Boulez, Jean Barraqué, Milton Babbitt, Luigi Nono, Karlheinz Stockhausen, Iannis Xenakis" revived modernism". In fact many literary Modernists lived into the 1950s and 1960s, though generally they were no longer producing major works. The term "late modernism" is also sometimes applied to Modernist works published after 1930. Among Modernists (or late Modernists) still publishing after 1945 were Wallace Stevens, Gottfried Benn, T. S. Eliot, Anna Akhmatova, William Faulkner, Dorothy Richardson, John Cowper Powys, and Ezra Pound. Basil Bunting, born in 1901, published his most important Modernist poem Briggflatts in 1965. In addition, Hermann Brochs The Death of Virgil was published in 1945 and Thomas Manns Doctor Faustus (novel) in 1947. Samuel Beckett, who died in 1989, has been described as a "later Modernist". Beckett is a writer with roots in the expressionist tradition of Modernism, who produced works from the 1930s until the 1980s, including Molloy (novel) (1951), Waiting for Godot (1953), Happy Days (play) (1961), and Rockaby (1981). The terms "minimalist" and "post-Modernist" have also been applied to his later works. The poets Charles Olson (1910-1970) and J. H. Prynne (born 1936) are among the writers in the second half of the 20th century who have been described as late Modernists.
Question: How many years after producing Happy Days did Beckett produce Rockaby?.
Output (English): number