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:
['9787', '1491', '4411', '5261', 'U', '9787', 'b']
answer:
30737


question:
['7669', '3367', 'A', 'Z', '6173', '4391', 'f', 'S', '9657', '2631']
answer:
33888


question:
['W', '5899', '8441', '3831', 'x', '3551', '9889', 'T', '2933', '9013', 'N', '3003', '4363', '4737', '1727', 'A']
answer:

57387