Chef And Magical Path

Chef is stuck in a two dimensional maze having N rows and M columns. He needs to get out of the maze as soon as possible and arrive at the kitchen in order to serve his hungry customers. But, he can get out of the maze only if he is able to successfully find any magical path in the given maze. A path is defined as magical if it starts from any of the cell (a,b) of the maze and ends at the cell (c