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:
['W', '3561', '4631', '8379', 'W', '6857', '2723', '5393', 'h', 'g', 't', 'I', 'R', '2321', 'l']
answer:
33865


question:
['t', '7469', 'Y', 'N', '8137']
answer:
15606


question:
['J', '1405', '2505', '8457', 'b', '1619', '9529', '4037', 'c']
answer:

27552