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]: ['A', '771', 'Q', 'b', '9929', '4991', 'q', '9863', '4363', '5721', 'C', '991', 'j', 'r', 'Q', 'B', 'K']
[EX A]: 36629

[EX Q]: ['3013', '3955', 'f', '1183', '5111', '9509', '2351', '7087', 'f']
[EX A]: 32209

[EX Q]: ['1931', 'I']
[EX A]:
1931