function kaprekarNumbers(p, q) {
  let answer = [];

  function findlandr(n) {
    let numstr = n.toString();
    let d = numstr.length;
    let sqnum = n * n;
    let sqnumstr = sqnum.toString();
    let dsq = sqnumstr.length;
    let sqnumarr = sqnumstr.split('');
    let rd = d;
    let ld = dsq - rd;
    let larr = [];
    let rarr = [];

    for (let i = 0; i < ld; i++) {
      larr.push(sqnumarr[i]);
    }
    let l = parseInt(larr.join(''));

    for (let i = ld; i < dsq; i++) {
      rarr.push(sqnumarr[i]);
    }
    let r = parseInt(rarr.join(''));

    return [l, r];
  }

  for (let i = p; i <= q; i++) {
    let lr = findlandr(i);
    if (lr[0] + lr[1] === i) {
      answer.push(i);
    }
  }

  if (p === 1) {
    answer.unshift(1);
  }
   if(!answer.length){
      console.log('INVALID RANGE')
  }else{
      console.log(answer.join(' '));
  }
}