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]: ['4241', 'E', '1807', '2877', '5125', '7625', 'S', '401', '5081', 'u', 'R', 'F']
[EX A]: 27157

[EX Q]: ['3873', 'D', 'J', '2799', 'k', 'F', 'I', '3457', '5647', '4815', '7509', 'Y', '1251', '2211']
[EX A]: 31562

[EX Q]: ['7921', 's', 'D', 'A', '8567', '9869', 'S', '3895', 'w', '7249', 'w', 'F', '4499']
[EX A]:
42000