def brute_force_crack(hashed_pass):
    char_list = create_possible_chars()

    # Store all string combinations
    password = ""

    # Build the combos adding each letter to each prefix and then to combos.
    def build_combos(curr_str):

        nonlocal password

        # Check password to return early
        if password != "":
            return
        if len(curr_str) == 4:
            return

        for letter in char_list:
            # Add letter to curr_str to build up the combo
            curr_str += letter

            if is_password(curr_str, hashed_pass):
                password = curr_str
                break

            build_combos(curr_str)
            # Reset curr_str to be used again in this iteration without the added letter
            curr_str = curr_str[:-1]

    build_combos("")
    return password