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:
['339', 'h', 'd', '7449', 'e', 'u', '5055', '7029', '9009', 'G', 'U', '3', '441', '3273', 'K', '3827', '7069', 'x']
answer:
43494


question:
['8667', '4129', '7075', '6345', '1315', 'M', 'F', '9073']
answer:
36604


question:
['6645', 'k', '4879', 'N', '113', 'L', 'x', '8365', 'v', 'A']
answer:

20002