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:
['1815', 'U', '869', 's', '1847', 'C', '2711', 'S', 'i', '7949', '4477', '5093', 'D', '8661', '3835', '4087', '73', 'V', '3149', 's']
answer:
44566


question:
['x', '1305', 'b', '8193']
answer:
9498


question:
['9451', 't', 'O', 'D', '9129', 'J', 'M', 'V', '3887', 'A', 'I', 'r', '7821', '2573']
answer:

32861