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:
['3557', '3345', '307', '9791', '1897', 'O']
answer:
18897


question:
['x', '1305', 'b', '8193']
answer:
9498


question:
['5527', 'g', '7213', 'B', '2739', 'f', 'p', 'w', 'e', 'Y', 'U']
answer:

15479