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:
['135', 'a', 'X', '8067', '8447', '4009', '4221', 'o', 'A', 'x']
answer:
24879


question:
['O', 'j', 'Z', 'u', '7427', '4225', '3139', '9993', '9945', '3639', 'h', 'j', 'f', '6511', 'e', '4607', '2741', '4743']
answer:
56970


question:
['6973', '5487', '5969', 'W', '6141', 'I', 'z', '5291', 'v', 'b', 'e', 'I', 't', '2547', 'c', 'd', 'g', 'b', '9']
answer:

32417