1  from lib import *
 2  
 3  input = read_input(2017, 19)
 4  
 5  lines = input.splitlines()
 6  
 7  
 8  w, h = len(lines[0]), len(lines)
 9  x, y = lines[0].index("|"), 0
10  dx, dy = 0, 1
11  out = ""
12  get = lambda x, y: lines[y][x] if y in range(h) and x in range(w) else " "
13  while True:
14      c = get(x, y)
15      f = get(x + dx, y + dy)
16      l = get(x + dy, y - dx)
17      r = get(x - dy, y + dx)
18      if c.isalpha():
19          out += c
20      if f == " ":
21          if l != " ":
22              dx, dy = dy, -dx
23          elif r != " ":
24              dx, dy = -dy, dx
25          else:
26              break
27      x += dx
28      y += dy
29  
30  print(out)
31  
32  
33  w, h = len(lines[0]), len(lines)
34  x, y = lines[0].index("|"), 0
35  dx, dy = 0, 1
36  out = 0
37  get = lambda x, y: lines[y][x] if y in range(h) and x in range(w) else " "
38  while True:
39      out += 1
40      f = get(x + dx, y + dy)
41      l = get(x + dy, y - dx)
42      r = get(x - dy, y + dx)
43      if f == " ":
44          if l != " ":
45              dx, dy = dy, -dx
46          elif r != " ":
47              dx, dy = -dy, dx
48          else:
49              break
50      x += dx
51      y += dy
52  
53  print(out)