Wait, the user's example might help. If the input is "The cat sat on the mat," the output would be those feline seated... but wait, "The" is lowercase here, so maybe proper nouns aren't capitalized. Hmm. Maybe the user is referring to any word that's a proper noun, regardless of capitalization. But in practice, proper nouns are usually capitalized, so perhaps the task is to skip words that are capitalized (i.e., proper nouns).
But how to generate the synonyms? The user might be using a thesaurus or similar tool. However, the example given in the user's mind might be: input word "happy," output content. So each word is replaced by three synonyms. Now, if the input has "John is happy," the output should be "John is joyful" because "John" is a proper noun and should be skipped. Konten Mbak Ratu STW Paruh Baya Binal Sange-an - INDO18
But wait, the user's instruction says "Skip proper nouns," so I should only process non-proper nouns. Let me confirm: proper nouns are capitalized, but not all capitalized words are proper nouns. However, in the context of the task, maybe the user just wants to skip words that are proper nouns, regardless of capitalization. For example, "New York" is a proper noun, but "new" is not. So I need to identify proper nouns. But how? That might be challenging without context. Maybe the user expects that the input text contains proper nouns, and I should check if a word is a proper noun (like capitalized words in a sentence). Wait, the user's example might help
