from collections import Counter
from easybits import Bits

def crack_caesar(ciphertext): 
    frequencies = Counter(ciphertext)
    most_common = frequencies.most_common(1)[0]
    most_common_character = most_common[0]

    space_value = Bits(' ').int
    character_value = Bits(most_common_character).int

    shift = character_value - space_value

    return shift