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]: ['d', '7305', '8903', 'b', '7687', '6393', '6939']
[EX A]: 37227

[EX Q]: ['l', 'B', 'Y', '7543', '5091', '1917']
[EX A]: 14551

[EX Q]: ['135', '6575', '4595', '3083', 'z', 'R', '4747', '8591', 's', 'B', 'h', '9555', '157', 'B', '819', 'e', 'I', '9739', '5167']
[EX A]:
53163