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]: ['s', 'd', 't', '8235', '2279', '7477', '3029', '4377', '9153', '4309', '2295', '407']
[EX A]: 41561

[EX Q]: ['5097', 'F', 'l', '319', 'h', '4637', '6699', 'A', 'l', 'M', 'D', '9695', 'F', '289', 'o', '8981']
[EX A]:
35717