import sys
from PIL import Image
src, out, rows = sys.argv[1], sys.argv[2], [int(r) for r in sys.argv[3].split(",")]
im = Image.open(src)
o = Image.new("RGB", (1024, 512 * len(rows)), (255, 255, 255))
for k, r in enumerate(rows):
    o.paste(im.crop((0, r * 512, 1024, r * 512 + 512)), (0, k * 512))
o.save(out)