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', '8169', '9067']
answer:
17236


question:
['g', 'A', 'r', '539', '5459', '2725', '7447', '3693', '1757', 'r', 'W', '5949', '4569', '5153', '3985', 'Q', '505', 'M', '8989']
answer:
50770


question:
['r', 'B', '8791', '3165', 'n', 'm']
answer:

11956