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:
['3469', 'n', '5561', '8597', '921', '4737', 'r', 'P', '7127', '3651', 'D', '1703', 'y']
answer:
35766


question:
['v', 'a', 'O', 'S', 'r', 'T', 'r', 'K', 'K', '7781', '1749']
answer:
9530


question:
['c', 'f', 'Y', '9615', '9355', 'n', 'w', 'Q', 'q']
answer:

18970