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]: ['1073', 'i', 'o', 'j', 'O', 'g', 'X', '3261', '5105', '4831', 'J']
[EX A]: 14270

[EX Q]: ['o', 'O', 'H', '7619', '6435', 'X', 'g', '1663']
[EX A]: 15717

[EX Q]: ['5745', 'm', '5249', '9145', '4147', 'S', 'T', 'p', '3603', 'L', '4557', '8225']
[EX A]:
40671