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]: ['Y', '8169', '9067']
[EX A]: 17236

[EX Q]: ['p', '4689']
[EX A]: 4689

[EX Q]: ['6563', '5299', 'q', '1655', '4449', '7051', 'e', '9603', 't']
[EX A]:
34620