def edge_title_generator(counter: int) -> str:
    chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
    num = (counter - 1) // len(chars) + 1
    letter_index = (counter - 1) % len(chars)
    return f"{chars[letter_index]}{num}"

def edge_title_to_number(title: str) -> int:
    chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
    letter = title[0].upper()
    number = int(title[1:])
    letter_index = chars.index(letter)
    return letter_index + 1 + (number - 1) * len(chars)