piccolo

function solve2(arr) {
    const parkingLot = new Set();

    for (const entry of arr) {
        const [dir, plate] = entry.split(', ');

        switch (dir) {
            case 'IN': {
                parkingLot.add(plate);
                break;
            }
            case 'OUT': {
                parkingLot.delete(plate);
                break;
            }
        }
    }

    if (parkingLot.size > 0) {
        [...parkingLot]
            .sort((a, b) => a.localeCompare(b))
            .forEach(carNumber => {
                console.log(carNumber);
        });
    }
    else {
        console.log('Parking Lot is Empty');
    }
}