Definition: You are given a paragraph, with numbered sentences, and a question. Write the numbers of the sentences needed to answer the given question. Separate multiple sentence numbers with a comma (", "). E.g. "1, 2" would be the correct response if Sent 1 and Sent 2 are needed to answer the given question (do not include sentences that contain no information that is necessary to answer the question). Sort the sentence numbers in an increasing order (i.e., '1, 2', instead of '2, 1'). Your answer should not contain anything than the sentence numbers separated by a comma (e.g. '1, 2, 3, 4'). The given question requires more than one sentence to answer. So, your answer must contain at least one comma (", ").
Input: Paragraph- Sent 1: I had drunk too much, I confess, though we all had.
Sent 2: Somehow, Tasha and I began to argue the worth of Solevgrad jazz, as inconsequential a topic as I can imagine.
Sent 3: She had studied it in school, so she thought herself as an expert.
Sent 4: I once had a neighbor who played it constantly, loudly, and badly, so I thought I knew it better.
Sent 5: Malaquez tried to mediate, but I saw him as siding with Tasha.
Sent 6: So, I think, did she.
Sent 7: The subject shifted from music to Tasha's obsession with fame, undoubtedly by a leap that I made.
Sent 8: She had no choice but to follow.
Sent 9: (I do not remember any of this well, just now, nor do I care to.
Sent 10: Those who are truly curious may look at the last act of "Captured Moments.") I remember suggesting, with characteristic tact, that she add Emil to her small list of major accomplishments.
Sent 11: Malaquez glanced away, embarrassed.
Sent 12: Tasha looked at me as if to say, "I will."Sent 13: She said, "I feel sorry for you, Nardo.
Sent 14: I'll see Emil home."Sent 15: "Yes," I said, "Do that," and did not care what she did, or why.
Sent 16: Emil asked, "You're all right?"Sent 17: I muttered something he must have interpreted as assent.
Sent 18: They both walked up to Emil's home while I watched the scarlet moonlight ripple on distant waves.
Sent 19: Disgusted with Tasha but more disgusted with myself, I finally realized she would not return that night and went into The Sleeping Flamingo to drink myself to sleep.
Sent 20: She had not come home when I woke in mid-morning. 
Question: Why did Nardo think himself an expert in Solevgard jazz?.
Output:
1, 2, 3.