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1·在1337年，彼特拉克开始撰写杂文《论名人》，主要突出古典英雄的美德。
In 1337, Petrarch began work on his rambling writing De Viris Illustribus—On Famous Men, highlighting the virtus (or virtue) of classical heroes.
2·试点村人口为1337人，多数村民为农民。
The population of the village was 1337. The majority of villagers were farmers.
3·由于结果可能会很大，因此将结果对1337取模。
Since the result could be very large, you should return the largest palindrome mod 1337.