Format the text

function solve() {
  let text = document.getElementById('input').value.split('.').filter(x => x.length >= 1);
  const output = document.getElementById('output');
  const numberPar = Math.ceil(text.length / 3);
  for (let i = 0; i < numberPar; i++) {
    const paragraph = extract3();
    output.innerHTML += `<p>${paragraph}</p>`;
  }

  function extract3 () {
    let count = 0;
    let result = [];
    while (text.length > 0) {
      if (count == 3) break;
      const sentence = text.shift() + '.';
      result.push(sentence);
      count++;
    }
    return result.join('');
  }
}