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:
['J', 'S', 'S', 'U', 'w', '7691', '7529', 'B', '3861', '4557', 'd', '569', '1547']
answer:
25754


question:
['4173', 's', 'v', '2007', '1723', 'l', 'N', '6419', '873', '5289', '9457', 'I', 'U', '1291', '9271', '2507', '8553', '6827', 'v', '9875']
answer:

68265