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def longest_sequence(string): max_length = 0 current_length = 0 previous_char = None for char in string.lower(): if char == previous_char: current_length += 1 else: current_length = 1 previous_char = char if current_length > max_length: max_length = current_length return max_length print(longest_sequence("aaabbBccc")) print(longest_sequence("Hello, world!")) print(longest_sequence("aabbbccddddd")) print(longest_sequence("xyz"))