'''
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 as length("World") = 5.

Please make sure you try to solve this problem without using library functions. Make sure you only traverse the string once.
'''

class Solution:
    # @param A : string
    # @return an integer
    def lengthOfLastWord(self, A):
        words = A.split()
        
        return len(words[-1]) if len(words) > 0 else 0
        
        
# Use CASES
if __name__ == '__main__':
    s = Solution()
    A = 'Hello World'
    print(s.lengthOfLastWord(A))
