let yPos = [];

var coll;

function setup() {

  createCanvas(400, 900);

  //background(0);

  frameRate(15);

  //background(0,0,0,250);

}

​

function draw() {

  background(0,0,0,25);

  //var coll=random(400)

  if(int(random(100))<50){

 append(xPos,random(400))

  append(yPos, random(1))

  }

  //fill(255, 255, 255);

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

    var letter = char(random(143859));

  //text(letter, xPos[i], yPos[i]);

    fill(0, 255, 0);

    text(letter, xPos[i], yPos[i]);

    yPos[i] = yPos[i] + 13;

  }

}

​