function piccolo(input) {
    let parkingLIst = {}
    input.map(el => el.split(', '))
        .map(el => {if (el[0] === "IN")  parkingLIst[el[1]] = el[1];
            else if (el[0] === 'OUT')delete parkingLIst[el[1]];
        });
        Object.entries(parkingLIst).sort().forEach(x => console.log(x[0]))
}