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:
['5233', 'i', 'Z', 'v', '4531', 'j', '61', '1725', '5915', '1677', 'F', 'K', 'M', 'Z']
answer:
19142


question:
['2945', '7491']
answer:

10436