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:
['z', 'E', 'u', '4437', '7767']
answer:
12204


question:
['o', 'E', '2085', '7003', 'P', '8393', 'X', 'f']
answer:

17481