​

function preload() {

  result = loadStrings("file.txt");

}

​

function setup() {

  createCanvas(400, 400);

  let writer = createWriter("newfile.txt");

  writer.write(result[0] + "\n");

  for (let i = 1; i < result.length; i++) {

    let line = result[i];

    let num = parseInt(line.substring(0, 5));

    if (num < 43000) {

      writer.write(line + "\n");

    } else {

      num--;

      writer.write(num.toString() + line.substring(5, line.length));

      writer.write("\n");

    }

  }

  writer.close();

}

​

function draw() {

  background(220);

}