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:
['6941', 'I', 'j', '6135', '6525', '7853', '5607']
answer:
33061


question:
['R', '2503', '2699', 'S', '3011', '5997', '6259', 'W', '7631', '7817', '9181']
answer:

45098