Black And White Cells

Chef and his best friend Aleksa are into mathematical games these days. Today, they have some ( ≥ 0 ) black cells represented as B, and a white cell represented as W, lying randomly in a straight line. They have decided to play with these cells. In a move, a player chooses some ( > 0 ) black cells lying on any one side of the white cell and remove them. It should be noted that a player is not allo