public class Pos
{
  private int row, col;
  public Pos(int r, int c) { row = r; col = c; }
  public int getRow() { return row; }
  public int getCol() { return col; }
  public String toString() { return row + "," + col; }
  public boolean equals(Pos p) { return row == p.row && col == p.col; }
}