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


question:
['9863', 'y']
answer:
9863


question:
['4601', '4077', 'q', 'c', '1439', '8295']
answer:

18412