import arxiv


def get_paper(paper=""):
    if paper:
        id = paper.split(" - ")
        print("id= ", id)
    
        paper = next(arxiv.Search(id_list=[id[-1]]).results())
        print("paper title= ", paper.title)
        name = str(paper.title) + '.pdf'
        name = name.replace('?', '')
        name = "downloads/" + name
        paper.download_pdf(filename=name)
        print(name)

    return(paper)