LeetCode - Length of Last Word

Given a string s consists of upper/lower-case alphabets and empty space characters ' ', return the length of last word in the string. If the last word does not exist, return 0.

Note: A word is defined as a character sequence consists of non-space characters only.

Example:
Given s = "Hello World",
return 5.

Solution
#!/bin/python
def lengthOfLastWord(self, a):
    a = a.strip()
    if not a:
        return 0
    return len(a.split()[-1])

    """
    :type s: str
    :rtype: int
    """