#!/usr/bin/env python3 lines = (x.strip() for x in open("input.txt")) points = set() for line in lines: if line.startswith("fold along x="): fold = int(line[13:]) points = set((fold - abs(x-fold), y) for x, y in points if fold != x) elif line.startswith("fold along y="): fold = int(line[13:]) points = set((x, fold - abs(y-fold)) for x, y in points if fold != y) elif len(line) > 0: points.add(tuple(int(num) for num in line.split(","))) max_x, max_y = tuple(map(max, zip(*points))) print('\n'.join(''.join('█' if (x, y) in points else ' ' for x in range(max_x+1)) for y in range(max_y+1)))