Write a method that accepts the length and width of a grid of X's. Return the number of X's that lie on the border. For exmaple: XXXX XXXX XXXX has 10 X's on the border. Here I have changed the X's on the border to O's: OOOO OXXO OOOO Notice that a 2 by 2 grid of X's is ALL border: XX XX Border marked with O's: OO OO Note that length and width will each be at least one.