let minx, miny;

let maxx, maxy

​

function setup() {

  createCanvas(1, 1);

  noLoop();

}

​

function draw() {

  parse();

  for(let i = 0; i < 50; i ++) {

    enhance((i+1)%2 == 0)

  }

  print(Array.from(img.keys()).length);

}

​

function enhance(empty) {

  let next = new Map();  

  let my = miny, My = maxy, mx = minx, Mx = maxx;

  let d = 1;

  for(let j = miny - d; j <= maxy + d; j ++) {

    for(let i = minx - d; i <= maxx + d; i ++) {

      if(pix(i, j, empty)) {

        let k = i + "," + j;

        next.set(k, true);

        if(i < mx) {

          mx = i;

        }

        if(i > Mx) {

          Mx = i;

        }

        if(j < my) {

          my = j;

        }

        if(j > My) {

          My = j;

        }

      }

    }

  }

  minx = mx;

  maxx = Mx;

  miny = my;

  maxy = My;

  img = next;

}

​

function pix(x, y, empty) {

  let i = idx(x, y, empty);

  return enh[i] === "#";

}

​

function idx(x, y, empty) {

  let idx = "";

  for(let j = -1; j <= 1; j ++) {

    for(let i = -1; i <= 1; i ++) {

      if(val(x + i, y + j, empty)) {

        idx += "1";

      } else {

        idx += "0";

      }

    }

  }

  return parseInt(idx, 2);

}

​

function val(x, y, empty) {

  if(x < minx || x > maxx || y < miny || y > maxy) {

    return empty;

  }

  return img.has(x + "," + y);

}

​

function parse() {

  img = new Map();

  enh = "";

  let splt = input.split("\n\n");

  enh = splt[0];

  imgRaw = splt[1].split("\n");

  w = imgRaw[0].length;

  h = imgRaw.length;

  for(let j = 0; j < h; j ++) {

    for(let i = 0; i < w; i ++) {

      if(imgRaw[j][i] === "#") {

        img.set(i + "," + j, true);

      }

    }

  }

  minx = 0;

  maxx = w-1;

  miny = 0;

  maxy = h-1;

}

​

let input = `########...#.###.##..#.....#####....#.#...#..##..##.###.....####...#.#..#.###...#.#.##...#..##.###..##......##....##....#.#..#...##.###..#.#.#####..##.##....#.#####.#.######...#.####....#.#.####..#.####.#.#..##......#....#.##...#...#...#......#...#...#.#.....###..#.##..#...####.##....#.#.#...##...####.#####.####.###.##.###.##...#.#.#...###.######....#.#.#.#..#.#....#####.#.##...##...##...##...#.#.#####.#...#.#######..#...##..#..#...#..####....###..#..##.##..#.#.##...#####......#.#.###.####...#.#.###.#.##.#.

​

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​

// input = `..#.#..#####.#.#.#.###.##.....###.##.#..###.####..#####..#....#..#..##..###..######.###...####..#..#####..##..#.#####...##.#.#..#.##..#.#......#.###.######.###.####...#.##.##..#..#..#####.....#.#....###..#.##......#.....#..#..#..##..#...##.######.####.####.#.#...#.......#..#.#.#...####.##.#......#..#...##.#.##..#...##.#.##..###.#......#.#.......#.#.#.####.###.##...#.....####.#..#..#.##.#....##..#.####....##...##..#...#......#.#.......#.......##..####..#...#.#.#...##..#.#..###..#####........#..####......#..#

​

// #..#.

// #....

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// ..#..

// ..###`;

​