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Given that, perhaps the code will check if the first character of the word is uppercase. If yes, leave as is. Otherwise, apply the options.

First, I need to figure out how to identify proper nouns. Proper nouns typically start with a capital letter and are names of specific people, places, organizations, etc. But sometimes common nouns can be capitalized too, like in titles or the start of a sentence. Hmm, that might complicate things. Wait, the user said "proper nouns stay", so maybe I should leave words that are all caps or start with a capital letter and are usually proper nouns. But how do I distinguish between that and just a common noun that happens to be capitalized? Maybe I can assume that any word with a capital letter in the middle of a sentence is a proper noun? Not sure. Maybe better to check if the word is a proper noun based on standard rules. For example, if the word is capitalized and not at the beginning of a sentence, it's more likely a proper noun. But this could be tricky without knowing sentence structure. Hmm, perhaps I should treat any word with a capital first letter as a proper noun unless it's at the start of a sentence. But how to determine sentence boundaries without knowing where sentences start?

if word is a proper noun (first char is upper, ignoring others for now):

But since this is a text processing task, the user wants the code to apply this transformation.