Write a Python program that takes a list of numbers as input from the user, calculates the sum of all even numbers in the list, and returns the result. The program should check if the input is valid (i.e., if it's a list of numbers), and if it's not, it should return an error message. The program should also handle exceptions gracefully and return a user-friendly error message in case of any exceptions. Your response must contain 3 sections, mark the beginning of each section with SECTION X. reply should include the word "Stuart" less than 2 times. Please wrap your entire reply with double quotation marks. You are not allowed to use any commas in your response. Make sure the answer contains exactly 2 bullet points in markdown format. The number of sentences in your response should be less than 3. answer exactly 4 paragraphs. Use 2 new lines to separate paragraphs. Start the first paragraph with the word "Stuart".
length_constraints:nth_paragraph_first_word detectable_format:multiple_sections keywords:frequency length_constraints:number_sentences detectable_format:number_bullet_lists startend:quotation punctuation:no_comma
answer exactly 4 paragraphs. Use 2 new lines to separate paragraphs. Start the first paragraph with the word "Stuart" Your response must contain 3 sections, mark the beginning of each section with SECTION X reply should include the word "Stuart" less than 2 times The number of sentences in your response should be less than 3 Make sure the answer contains exactly 2 bullet points in markdown format Please wrap your entire reply with double quotation marks You are not allowed to use any commas in your response