Write the function military-hour that takes a sentence containing a time (in hours only) and returns the military hour as follows:

• 0 if the time is 12am
• 1--12 if the time is between 1am and 12pm
• 13--23 if the time is between 1pm and 11pm

Make sure that your program works on all of these examples!

; > (military-hour '(12 am))
; 0
; > (military-hour '(12 pm))
; 12
; > (military-hour '(1 pm))
; 13
; > (military-hour '(10 pm))
; 22
; > (military-hour '(4 am))
; 4

(define (military-hour sent)
  'YOUR-CODE-HERE)