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', '4991', '7289', '4355', 'I', '8415', '5175', '5329', 'G', 'a', '7193', 't', '8821', 'j', '7239', '405', 'y', 'O', '9881', 'w']
answer:
69093


question:
['m', 'e', 'W', 'N', '4459', '693', '3765', '2641']
answer:
11558


question:
['C', 'd', '2519', '9525', '6121']
answer:

18165