output some string

[Gianmaria Lari]

I'm trying to write some code in scheme. At the moment I do it using frescobaldi and I need some help for the output.

The following code

\version "2.19.81"

#(define (f w) w)

$(f "Hello")

generates a pdf file containing "Hello". 

If my function f is called passing something that is not a string like in the following code

\version "2.19.81"

#(define (f w) w)

$(f '(a b c))

it doesn't work. How can I convert my data to a string?

Thank you, g.

P.S. I have been able to write in the Lilypond log using  #(define (f w) (write w))...