function growingWord() {

  let clicks = 0,
  button  = document.querySelector('button'),
  paragraph = document.querySelector('#exercise p');
  color = '';

  button.onclick = function() {
    clicks += 1;

    if(clicks % 3 === 0){
      color = 'red';
    }
    else if(clicks % 3 === 1){
      color = 'blue';
    }
    else if(clicks % 3 === 2){
      color = 'green';
    }

    paragraph.style.color = color;
    paragraph.style.fontSize = `${clicks * 2}px`;
  };

  console.log(clicks);
}