import requests


def ad2id(input_str):
    if len(input_str) < 4:
        return ([], "4글자 이상으로 작성해주세요.")

    base_url = "https://cache.nova.gd/user/v1"
    users = []
    error_message = None

    try:
        if input_str.startswith("0x"):
            url = f"{base_url}/by-address/{input_str}"
            response = requests.get(url)
            if response.status_code == 200:
                users = response.json()  # 'by-address' 가 리스트를 직접 반환한다고 가정
            else:
                error_message = f"Request failed with status code {response.status_code}"
    except Exception as e:
        error_message = str(e)

    if error_message:
        return ([], error_message)

    if not users:
        return ([], "검색 결과 없음")

    formatted_result = "".join(f"{user['nickname']}" for i, user in enumerate(users))
    return formatted_result


a = ad2id("0x9526E51ee3D9bA02Ef674eB1E41FB24Dc2165380")
print(a)