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.

[EX Q]: ['4749', '1169', '4273', 'X']
[EX A]: 10191

[EX Q]: ['2175', '4539', 'L', 'T', 'q', '2407', 'F', 'V', 'b', '9475', '2279', '4469', '6231']
[EX A]: 31575

[EX Q]: ['2921', '3277', '3911', 'I', 'G', 'j', 'i', 'I', 'D', '9743']
[EX A]:
19852