How to allow lists to be entered as arguments Scheme -

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I am trying to write the process that accepts at least two arguments that are in both lists. Can I just enter that list as logic in order to use 'X' and 'Y'? I have already written this process and I do not see any error with it, but when I try to run it, the Interaction panel says "Application: No Process; The process expected was given Arguments can apply: 2 logic ...:

3 "And I do not know much about this process, the process I am writing is down. 

  (define (less xy) (if ((length x) & lt; (length y)) x (if ((xx)> (length y) yx)) )   
 
 
 The racket is a prefix language, which means that operators should come before logic . Regarding how (<(p (> (length x) (length y) yx):  
  (defined (lower xy) (if (& lt; (length x) (Length y)))  
 
 or ... 
 
  (define (less xy) (if (& lt; = (length x) ( Length y)) xy))

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