Problem Statement  
A teacher wants to take his students to see a movie at the theater. The only problem is that the students talk a lot, so the teacher doesn't want any two students in the same row to sit in adjacent seats. You are given a String[] seats which contains information about which seats are available for purchase. Character j of element i of seats is 'Y' if the jth seat in row i is available, or 'N' otherwise. Return the maximum number of students who can watch the movie.  
Definition  
 
Constraints  
  seats will contain between 1 and 50 elements, inclusive.  
  Each element of seats will contain between 1 and 50 characters, inclusive.  
  All elements of seats will be of equal length.  
  Each element of seats will contain only 'Y' or 'N' characters.  
Examples  
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