function fizzBuzz(num) {
  if (typeof num != 'number' || num == '') {
    return false
  }
  if (num%3 == 0 || num%5 == 0) {
    return `${num%3 == 0 ? 'fizz' : ''}${num%5 == 0 ? 'buzz' : ''}`
  }
  return num
}