function solve () {
  const rightAnswers = [
    'onclick',
    'JSON.stringify()',
    'A programming API for HTML and XML documents'
  ]

  let counter = 0
  Array.from(document.querySelectorAll('.answer-text')).forEach(a =>
    a.addEventListener('click', showNext)
  )

  function showNext () {
    let section = this.parentNode.parentNode.parentNode.parentNode
    let nextSection = section.nextElementSibling

    section.style.display = 'none'
    nextSection.style.display = 'block'

    if (rightAnswers.includes(this.textContent)) {
      counter++
    }

    if (nextSection.id === 'results') {
      section.style.display = 'none'
      nextSection.style.display = 'block'
      document.querySelector('#results h1').textContent =
        counter === 3
          ? 'You are recognized as top JavaScript fan!'
          : `You have ${counter} right answers`
    }
  }
}