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Two main ways, make it a web application (have a look at Hunchentoot and similar). Or from the command line like this from Practical Common Lisp:
(defun prompt-read (prompt)
(format *query-io* "~a: " prompt)
Also see Chapter 6 of Land of Lisp.
Just as a style note, use binary-to-decimal or binary->decimal rather than btod.
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