def find_neighbor_titles(movies, indices):
    titles = indices.copy()
    K = indices.shape[1]
    for i in range(K):
        titles = titles.merge(movies[['title']], left_on=i, right_index=True, how="left")
        titles = titles.rename(columns={'title': 'title_{}'.format(i+1)})
    return titles.drop(list(range(K)), axis=1)