/*
 * Class for representing a position in the range.
 */
class Position 
{
    private int x, y;
    
    public Position(int x, int y) 
    {
        // constructor: set values for x and y
        this.x = x;
        this.y = y;
    }
    public int getX() 
    {
        return x;
    }
    public int getY() 
    {
        return y;
    }
    public String toString() 
    {
        // format with the standard (x, y) pair notation
        return String.format("(%d, %d)", x, y);
    }
    public boolean equals(Position other) 
    {
        // a useful equals method
        return this.x==other.x && this.y==other.y;
    }
    
    public Position move(Direction d) 
    {
        // return the position that would result if we moved one
        // step in the given direction.  Return a null reference if
        // that's not possible.
        if ( d == Direction.stay ) 
	{
            return new Position(x, y);
        } 
	else if ( d == Direction.east && x<Param.maxX-1 ) 
	{
            return new Position(x+1, y);
        } 
	else if ( d == Direction.west && x>0 ) 
	{
            return new Position(x-1, y);
        } 
	else if ( d == Direction.north && y<Param.maxY-1 ) 
	{
            return new Position(x, y+1);
        } 
	else if ( d == Direction.south && y>0 ) 
	{
            return new Position(x, y-1);
        }
        return null;
    }
}