instruction:
In this task, you are given an input list A. You need to find all the elements of the list that are numbers and calculate their sum.
question:
['J', '177', '8449', '2067', 'a', 'G', 'p', 'd', '5161', 'M', '2403', '5541', 'q', '4375', 'O']
answer:
28173


question:
['7411', 'Y', 'x', 'l', '4119', '7241']
answer:
18771


question:
['8739', 'K']
answer:

8739