What does 57577 mean?

It may be a Japanese poetic meter. For example, the five-character rhyme is 5555555555. 57577 is similar to

My heart and my dream are in Wu Heyue. I don't know what year tonight is. When I went out laughing, an almond came out of the wall.

The poems compiled by this organization are only those compiled by the Japanese, and the ancient poetry does not have this format.