After her critical success with her debut children's novel "The Confidences of Britt-Mari" (1944), Lindgren sent the manuscript for "Pippi Longstocking" to her editor at Rabén and Sjögren, the children's librarian and critic Elsa Olenius, in May 1945. Olenius advised her to revise some of the "graphic" elements, such as a full chamber pot being used as a fire extinguisher, and then to enter it into the upcoming competition at Rabén and Sjögren, which was for books targeted at children between the ages of six and ten. Critic Ulla Lundqvist estimates that a third of the manuscript was altered, with some changes made to improve its prose and readability, and others done to the character of Pippi, who according to Lundqvist "acquire a new modesty and tenderness, and also a slight touch of melancholy," as well as "less intricate" dialogue. "Pippi Longstocking" placed first and was subsequently published in November 1945 with illustrations by Ingrid Vang Nyman. Two more books followed: "Pippi Goes on Board" (1946) and "Pippi in the South Seas" (1948). Three picture books were also produced: "Pippi's After Christmas Party" (1950), "Pippi on the Run" (1971), and "Pippi Longstocking in the Park" (2001).