function solve (arr) {


  let indexOfParty = arr.indexOf('PARTY');

  let guestList = arr.splice(0, indexOfParty);

  arr.shift();

  // console.log(arr);

  let vip = [];

  let regular = [];


  for (let el of guestList) {

    if (isNaN(el[0])) {

      regular.push(el);

    } else {

      vip.push(el);

    }

  }



  for (let el of arr) {

    if (regular.includes(el)) {

      let index = regular.indexOf(el);

      regular.splice(index, 1);

    } else if (vip.includes(el)) {

      let index = vip.indexOf(el);

      vip.splice(index, 1);

    }

  }


  let countAbsentGuests = regular.length + vip.length;

  console.log(countAbsentGuests);


  for (let el of vip) {

    console.log(el);

  }


  for (let el of regular) {

    console.log(el);

  }


}