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.

[Q]: ['3121', 'j']
[A]: 3121


[Q]: ['J', '5149', 'H', 'L', 'm', 'h', '3863', 'n', 'z']
[A]: 9012


[Q]: ['4517', '9581', 't', '1989', 'R', '9659', '6955', 'h', 'X', 'a', 'j', '3961', 'y', '2619', 'j', 'P', 's', '7871', 'W', '5355']
[A]:
52507