function guestsTracker(input) {
    let i = 0;
    let currentGuest = input[i];

    let myArr = [];
    while (currentGuest !== 'PARTY') {
        myArr.push(currentGuest);
        i++
        currentGuest = input[i];
    }
    i++

    while (i < input.length) {
        currentGuest = input[i];
        if (myArr.includes(currentGuest)) {
            let index = myArr.indexOf(currentGuest)
            myArr.splice(index, 1);
            i++
        }
    }
    console.log(myArr.length);
let newArr = []
    for (let el of myArr) {

        if (!isNaN(el[0])) {
            console.log(el)

        }else{

            newArr.push(el)
        }
    }
    for (let el of newArr) {
        console.log(el)
    }
}