Given the matrix a, return the index r of the row with the most nonzero elements. Assume there will always be exactly one row that matches this criterion.

Example:

 Input  a = [ 1 2 0 0 0
              0 0 5 0 0 
              2 7 0 0 0
              0 6 9 3 3 ]
 Output r is 4

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