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:
['z', 'U', '6817', 's', '3731', 'M', 'I', '1095', 'l', '5993', '5207', 'e', 'L', '5361', 'v', 'g', '1963', '4829', '9541', '8261']
answer:
52798

question:
['7361', '3605', 'V', '2039', '9665', 'X', 'b', '1195', '657', '6509', '7195', '2013', '1847', 'v', '9499', '1761']
answer:
53346

question:
['1299', '3523', '8163', '9569', '9593', 'n', 'k', '7387', 'B', 'N', '953']
answer:
40487