def draw_point(r, g, b, m, n, grid):
    """Draws a point on the ppm grid

    Arguments
    ---------
    r, g, b -- RGB values for the point
    m, n -- row, column
    grid -- ppm grid being edited
    """
    grid[m][n][0], grid[m][n][1], grid[m][n][2] = r, g, b

    return grid