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]: ['x', '9895', 'r', 'H', 'C']
[EX A]: 9895

[EX Q]: ['D', 'm', 'P', '2433', '6731']
[EX A]: 9164

[EX Q]: ['7927', '8429', 'E', '6247', '5499', '1085', '3059', '6227', 'B', 'A', 'I', '2571', '4539', '6085', '7861', '1761']
[EX A]:
61290