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:
['K', '4403', 'a', '3881', '4139', 'w', '1861', 'G']
answer:
14284


question:
['M', 'H', 'l', 'Y', '3811', '1953', '5869', 'U']
answer:
11633


question:
['R', 'k', 'I', 'c', 'i', 'j', '1651', '9561', '99', '4403', 's', '7089', '3181']
answer:

25984