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seats = [
["X", "O", "O", "X"],
["O", "O", "X", "O"],
["X", "X", "O", "O"]
]
print("Enter row (0-2):")
r = int(input())
print("Enter column (0-3):")
c = int(input())
status = seats[c][r]
if status == "??????":
print("??????")
else:
print("??????")