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]: ['l', 'V']
[EX A]: 0

[EX Q]: ['u', 'B', '2509', 'U', 'R', '7497', '1897', '8697', 't', 'W', '1021', '7937', 'F', 'g', '6901', 'I', '2957']
[EX A]: 39416

[EX Q]: ['p', '2521', '9123', '6017', 'z', 'o', '8251', 'E', 'I', 'G', '53', 'r', 'W', 'z', '5071']
[EX A]:
31036