English ordinal numbers may function as either an adjective or as a noun, and almost never appear in the plural.
"fifty-seventh." YourDictionary, n.d. Web. 20 September 2018. <http://www.yourdictionary.com/fifty-seventh>.
fifty-seventh. (n.d.). Retrieved September 20th, 2018, from http://www.yourdictionary.com/fifty-seventh
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