def ruch(gracz):

  # Get position from player
  print(gracz + "'s turn.")
  pozycja = input("Choose a position from 1-9: ")

  # Whatever the user inputs, make sure it is a valid input, and the spot is open
  valid = False
  while not valid:

    # Make sure the input is valid
    while pozycja not in ["1", "2", "3", "4", "5", "6", "7", "8", "9"]:
      pozycja = input("Choose a position from 1-9: ")

    # Get correct index in our board list
    pozycja = int(pozycja) - 1

    # Then also make sure the spot is available on the board
    if plansza[pozycja] == "-":
      valid = True
    else:
      print("You can't go there. Go again.")