Design a Python function verifying if every non-numeric character in a string is encapsulated by plus signs.
Write a Python function named `plus_surrounded(s)`. This function should determine if all non-numeric characters in the given string `s` are surrounded by plus (`+`) signs. If this condition is met, the function should return `True`. Otherwise, it should return `False`. ### Parameters - `s` (str): A string to check. The length of `s` is within the range [1, 100]. `s` consists exclusively of alphanumeric characters and the plus sign (`+`). ### Return Value - The function should return `True` if every non-numeric character in `s` is surrounded by plus (`+`) signs. Otherwise, return `False`. ### Examples ```python # All letters 'f', 'd', 'c', 'f', are surrounded by '+' plus_surrounded("+f+d+c+#+f+") # ➞ True # All letters 'd', 's', are surrounded by '+' plus_surrounded("+d+=3=+s+") # ➞ True # The letter 'f' is not surrounded by '+' plus_surrounded("f++d+g+8+") # ➞ False # The letter 's' is not surrounded by '+' plus_surrounded("+s+7+fg+r+8+") # ➞ False ```