answer:Here's an updated version of the function with improved error handling: ```python def roman_to_decimal(s): roman_map = { 'I': 1, 'V': 5, 'X': 10, 'L': 50, 'C': 100, 'D': 500, 'M': 1000 } if not isinstance(s, str): raise TypeError(Input must be a string) s = s.upper() if not s: raise ValueError(Input string cannot be empty) decimal = 0 for i, char in enumerate(s): if char not in roman_map: raise ValueError(fInvalid Roman numeral: Unknown character '{char}' at position {i+1}) # Check for consecutive repetitions of characters that are not allowed if i > 0 and char in ['V', 'L', 'D'] and char == s[i - 1]: raise ValueError(fInvalid Roman numeral: Character '{char}' cannot be repeated at position {i+1}) # Check for more than three consecutive repetitions of 'I', 'X', 'C', 'M' if i >= 3 and char in ['I', 'X', 'C', 'M'] and char == s[i - 1] == s[i - 2] == s[i - 3]: raise ValueError(fInvalid Roman numeral: Character '{char}' cannot be repeated more than three times at position {i+1}) # If this is not the last character and the next character is greater, # subtract this character's value. Otherwise, add it. if i < len(s) - 1 and roman_map[s[i + 1]] > roman_map[char]: decimal -= roman_map[char] else: decimal += roman_map[char] return decimal # Test the function print(roman_to_decimal('III')) # Outputs: 3 print(roman_to_decimal('IV')) # Outputs: 4 print(roman_to_decimal('IX')) # Outputs: 9 print(roman_to_decimal('MCMXCIX')) # Outputs: 1999 # Error cases try: roman_to_decimal('VV') except ValueError as e: print(e) # Outputs: Invalid Roman numeral: Character 'V' cannot be repeated at position 2 try: roman_to_decimal('IIII') except ValueError as e: print(e) # Outputs: Invalid Roman numeral: Character 'I' cannot be repeated more than three times at position 4 try: roman_to_decimal('Z') except ValueError as e: print(e) # Outputs: Invalid Roman numeral: Unknown character 'Z' at position 1 try: roman_to_decimal('') except ValueError as e: print(e) # Outputs: Input string cannot be empty ``` This updated version includes checks for consecutive repetitions of characters that are not allowed (like VV, LL, DD) and more than three consecutive repetitions of 'I', 'X', 'C', 'M'. It also checks for an empty input string.

answer:The function can be modified to handle lowercase Roman numerals as inputs by converting the input string to uppercase before processing it. This is already done in the existing function: ```python s = s.upper() ``` This line converts the entire input string `s` to uppercase, so that the function can handle both uppercase and lowercase Roman numerals as inputs. With this modification, the function will correctly handle inputs like 'iii', 'iv', 'ix', etc., and will treat them as equivalent to their uppercase counterparts 'III', 'IV', 'IX', etc. No further modifications are needed to handle lowercase Roman numerals, as the existing function already takes care of case conversion.

answer:Emily is excited about the session ideas and suggests meeting next Wednesday afternoon.

answer:What a fascinating concept! A young artist with the power to breathe life into her creations opens up a world of possibilities. Here's a starting point: imagine your protagonist, who we'll call Lily, discovering her abilities by accident. Perhaps she's working on a piece that she's particularly passionate about, and as she adds the final touches, the colors begin to swirl and the figures start to move. One direction this story could take is exploring the consequences of Lily's newfound power. As word spreads about her abilities, she might attract attention from art collectors, galleries, and even those who seek to exploit her talents for their own gain. This could lead to a thrilling narrative of Lily navigating the cutthroat art world, all while keeping her powers a secret and learning to control them. Alternatively, Lily's abilities could lead her down a more fantastical path. She might find herself transported into the world of her paintings, where she must navigate the landscapes and characters she's created. This could be a wonderful opportunity to explore themes of identity, creativity, and the power of imagination. Another possibility is that Lily's paintings start to take on lives of their own, becoming entities with their own desires and motivations. This could lead to a fascinating exploration of the relationship between creator and creation, as Lily grapples with the responsibilities that come with bringing new life into the world. You could also delve into the darker side of Lily's powers. Perhaps each time she brings a painting to life, she loses a piece of herself, or the creations become increasingly twisted and malevolent. This could create a sense of tension and foreboding, as Lily must confront the costs of her abilities and the potential dangers they pose. Lastly, consider the emotional resonance of Lily's story. How does her power affect her relationships with others? Does she struggle with feelings of isolation or loneliness, knowing that she's the only one who truly understands her abilities? Exploring these emotional depths could add a rich layer of complexity to your narrative. Which of these directions resonates with you, or do you see your story unfolding in a completely different way?