Scheme: What type is read?

When I read from user input from the console in scheme, what is the type that I need to use if i’m converting from that type into something I want?

For example
(string->number “20”) converts the string into a number, what is the syntax for this regarding a read?


(define input(read)
    (let ((r read))
    (????->number r)))

Source: syntax

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