Then you can input the command, which includes 3 types:
x,y,B Mark the coordinate position (x,y) as a mine, which will be displayed in '@'.It can be cancelled by the input of x,y,N . Everytime you mark a
mine, the total number of mines will be subtracted by 1.

x,y,N Mark the coordinate position (x,y) as a non-mine location in order to obtain a new tip.The number displayed in the vertex represents the
number of neighboring mines adjacent to that square (1 - 8). Notice that if the number is 0, all non-mine locations can be recursively opened around
the previous one.

The object of the game is to uncover all squares that don't contain mines and mark all the mines.If you uncover a mine, you lose.(Minesweeper, installed by default on most computers that come with Windows, is one of the most classic computer games of all time. Now we can enjoy a
much simpler version of the game in the DOS command window)