import random


def select_starting_point(map):
    """Return at random one possible starting point [row_index, column_index]
    """
    starting_points = []
    for row_idx, row in enumerate(map):
        for col_idx, col in enumerate(row):
            if col == 's':
                starting_points.append([row_idx, col_idx])
    return random.choice(starting_points)