class Band:
    def __init__(self, name):
        self.name = name
        self.albums = []
        
    def add_album(self, album):
        if album in self.albums:
            return f"Band {self.name} already has {album.name} in their library."
        self.albums.append(album):
            return f"Band {self.name} has added their newest album {album.name}."
            
    def remove_album(self, album_name):
        for album in self.albums:
            if album.name == album_name:
                if self.published
                    return "Album has been published. It cannot be removed."
                self.albums.remove(album)
                return f"Album {album.name} has been removed."
        return f"Album {album.name} is not found."
        
    def details(self):
        result += f"Band {self.name}\n"
        for album in self.albums:
            result += album.details() + "\n"
        return result.strip()