I need to write this program in python

The first and second parameters refer to the row and column indices, respectively, of a cell in a valid game board whose size is given by the last parameter. The third parameter refers to a string that describes one of the directions: DOWN, ACRoss, DOWN_RIGHT, or DOWN LEFT. This function is to return the str index of the last cell in a line that begins at the specified location and goes in the specified direction all the way get last index: ilat, iat, ats, int in to the game board boundary, on a game board of the specified size. You may assume that the row or column number is valid for the game board You may also assume that, when the direction is DOWN LEFT, the row and column are either on the top row or the rightmost column of the game board, and when the direction is DoWN RIGHT, the row and column are either on the top row or the leftmost column of the game board