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:
['D', 'K', 'n', 'd', 'i', 'U']
answer:
0


question:
['7231', '2813', '51', '1745', 'c', 'a', '4929', '3185', '5707', '2095', 'f', 'S']
answer:
27756


question:
['H', '2593']
answer:

2593