from typing import List

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

g = game_result

s = ['', '', '', ]

l = ['', '']

for i in range(3):

for j in g:

s[i] += j[i]

j = 0

k = 2

for i in g:

l[0] += i[j]

l[1] += i[k]

j += 1

k += -1

total = s + l + g

if "XXX" in total:

return "X"

if 'OOO' in total:

return "O"

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!")