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. Refrain from using commas in your response. Make sure to use the word digital less than 3 times. Limit the number of words you use (less than 66 words). Finish the response with this exact phrase: your love, and thanks. . Make sure to include the words financial. You must highlight at least 3 words or phrases in your response, like *highlighted phrase*. make sure there are exactly 4 sections. Separated the sections by the markdown divider: ***.
length_constraints:number_paragraphs length_constraints:number_words punctuation:no_comma keywords:frequency startend:end_checker keywords:existence detectable_format:number_highlighted_sections
make sure there are exactly 4 sections. Separated the sections by the markdown divider: *** Limit the number of words you use (less than 66 words) Refrain from using commas in your response Make sure to use the word digital less than 3 times Finish the response with this exact phrase: your love, and thanks.  Make sure to include the words financial You must highlight at least 3 words or phrases in your response, like *highlighted phrase*