Party Time

function partyTime(input) {
    let invitedList = input.splice(0, input.indexOf("PARTY"));
    input.splice(0, 1);
    let VIP = [];
    let regular = [];
    for (let guest of invitedList) {
        if (guest[0] >= '0' && guest[0] <= '9') {
            VIP.push(guest);
        } else {
            regular.push(guest);
        }
    }
    for (let guest of input) {
        if (VIP.includes(guest)) {
            VIP = VIP.filter(x => x !== guest);
        }
        if (regular.includes(guest)) {
            regular = regular.filter(x => x !== guest);
        }
    }

    console.log(VIP.length + regular.length);
    VIP.forEach(x => {
        console.log(x);
    });
    regular.forEach(x => {
        console.log(x);
    });

}