---------------------------------

def solution(my_string):

return sum(int(i) for i in my_string if i.isdigit())

---------------------------------

def solution(my_string):

answer = 0
for i in my_string:
    try:
        answer = answer + int(i)
    except:
        pass

return answer

---------------------------------

import re

def solution(my_string):

return sum(int(n) for n in re.sub('[^1-9]', '', my_string))