What is the content of long phony letter that sally had written to holden?

The question refers to a long phony letter that Sally Hayes, a character from J.D. Salinger's novel *The Catcher in the Rye*, supposedly wrote to Holden Caulfield.

However, there is no mention of such a letter in the book. It is possible you are thinking of a fan-written piece or a piece of fanfiction that imagined this letter. If you can provide more context, such as where you encountered this idea, I might be able to help further.

If you are interested in exploring the relationship between Holden and Sally, there are many scenes in the book that delve into their complex and often frustrating dynamic.