String[] userInputCoords = new Scanner(System.in).nextLine().toUpperCase().split(" ");

while (!userInputCoords[0].matches(ConstantsModel.COORDS_REGEX)
    && !userInputCoords[1].matches(ConstantsModel.COORDS_REGEX)) {
    System.out.println(ConstantsModel.TELL_ERROR);
    askCoords(ship.getName(), ship.getSize());
    serInputCoords = new Scanner(System.in).nextLine().toUpperCase().split(" ");
}

int[] parsedCoords = parseCoordsToArrayIndexes(userInputCoords);
int[] fullShipCoords = extrapolateBodyCoords(parsedCoords, ship.getSize());
CoordinateModel[] shipCoordinates = new CoordinateModel[fullShipCoords.length];