​

function setup() {

  createCanvas(400, 400);

  //console.log(txt.length);

  frameRate(15);

}

​

function draw() {

  background(255);

  textSize(32);

  // top part of the sketch

  // putting letters one on top of each other

  for(let i = 0 ; i < txt.length ; i++){

    text(txt[i], width/2, height/4);

  }

  // bottom part of the sketch

  text(txt[frameCount % txt.length], width/2, 3*height/4);

}