@CheckiO@Xs and Os Referee

from typing import List

def checkio(game_result: List[str]) -> str:

    '''
    [0][0],[0][1],[0][2]
    [1][0],[1][1],[1][2]
    [2][0],[2][1],[2][2]
    '''

    for row in game_result:
        if row[0] == row[1] == row[2] and row[0] != ".":
            return row[0]

    if game_result[0][0] == game_result[1][0] == game_result[2][0] and game_result[0][0] != ".":
        return game_result[0][0]

    if game_result[0][1] == game_result[1][1] == game_result[2][1] and game_result[0][1] != ".":
        return game_result[0][1]

    if game_result[0][2] == game_result[1][2] == game_result[2][2] and game_result[0][2] != ".":
        return game_result[0][2]

    if game_result[0][0] == game_result[1][1] == game_result[2][2] and game_result[0][0] != ".":
        return game_result[0][0]

    if game_result[0][2] == game_result[1][1] == game_result[2][0] and game_result[0][2] != ".":
        return game_result[0][2]

    return "D"


if __name__ == '__main__':
    print("Example:")
    print(checkio(["X.O",
                   "XX.",
                   "XOO"]))

    #These "asserts" using only for self-checking and not necessary for auto-testing
    assert checkio([
        "X.O",
        "XX.",
        "XOO"]) == "X", "Xs wins"
    assert checkio([
        "OO.",
        "XOX",
        "XOX"]) == "O", "Os wins"
    assert checkio([
        "OOX",
        "XXO",
        "OXX"]) == "D", "Draw"
    assert checkio([
        "O.X",
        "XX.",
        "XOO"]) == "X", "Xs wins again"
    print("Coding complete? Click 'Check' to review your tests and earn cool rewards!")