import hashlib
import signal

def rotate(seq):
  last_seq = True
  mod_next = True
  idx = 0

  while mod_next and idx < len(seq):
    mod_next = False

    if last_seq:
      last_seq = seq[idx] == ord("f")

    if seq[idx] == ord("9"):
      seq[idx] = ord("a")
    elif seq[idx] == ord("f"):
      seq[idx] = ord("0")
      mod_next = True
    else:
      seq[idx] += 1

    idx += 1

  return not last_seq

hash_str = ""
show = lambda sig, frame: print("\rcurrently on:", hash_str)
hash_bytes = [ord("0") for _ in range(64)]
should_rotate = True

signal.signal(signal.SIGTSTP, show)

while should_rotate:
  hash_str = "".join([chr(byte) for byte in hash_bytes[::-1]])
  sha_hash = hashlib.sha256(hash_str.encode("utf-8")).hexdigest()

  if hash_str == sha_hash:
    print(hash_str)

  should_rotate = rotate(hash_bytes)