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:
['Y', '9053', 'N', '6921']
answer:
15974

question:
['i', 'o', '5363', '5937', 'x', '6705', 'w', '5495', 'E', '9823', 'F', '83', '8443', '5223']
answer:
47072

question:
['1207', 'c', 'k', 'f']
answer:
1207