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:
['U', '5607', 'Q', 'j', 'I', '3745', '3031']
answer:
12383


question:
['7411', 'Y', 'x', 'l', '4119', '7241']
answer:
18771


question:
['2105', 'm', '7041', 'n', '6733', '1819', 'a', 'P', 'l', 'U', '3539', 'z', 'n']
answer:

21237