from PIL import Image
from string import ascii_letters
import ipdb
i = Image.open("challenge.x.png")

ret = filter(lambda x: x in ascii_letters+" .,", i.tobytes())

lines = []
for line in range(640):
    c = 0
    for col in range(640):
        pix = i.getpixel((line, col))
        if not pix == (0, 0, 0):
            c += 1
            preresult += ret.pop(0)
    if c:
        lines.append(c)

result = ret[:36]
offset = 36
halfs = lines[1:-2]
for half in halfs:
    result += ret[offset+half/2:offset+half]
    offset += half

print result