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

[EX Q]: ['D', 'b', 'h', 'p', '1637']
[EX A]: 1637

[EX Q]: ['3657', 'r', '3047', '5255', 'P', 'H', '7093']
[EX A]:
19052