def check_win(game_state, token):
    all_rows = [[line[x] for line in game_state] for x in range(len(game_state))] + [game_state[len(game_state)-x-1][x] for x in range(len(game_state))] + [game_state[x][x] for x in range(len(game_state))]
    for line in all_rows:
        if sum([1 for t in line if t == token]) == len(game_state):
               return token
    return " "