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', 'X', 'd', 'N', '1877', '2865', 'M', '1249', '9385', 'v', 'o', 'P', 'P', '6029']
[EX A]: 21405

[EX Q]: ['h', '2335', '2669', '6035', '9901', '7721', 's', '6181', 'C', 'l', 'x', '8275', '1103', 'S', '6447']
[EX A]: 50667

[EX Q]: ['6579', 't', 'P', 'A', '5745', '8069', '7863', 'Y', 'C', 'l', 'Z']
[EX A]:
28256