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:
['8871', '1297', 'W', 'f', 'Y', '8731', '113', '6707', '379', '9631', 'X', 'C', 'q']
answer:
35729


question:
['b', '5447', 'R', '8489', 'L', '627', 'P', '7491', 'c', 'c', 'r', '6923', '1167']
answer:
30144


question:
['R', '5033', 'A', '7231', '4707', 'Z', '8473', 'U', '7797', 'Z']
answer:

33241