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]: ['c', 'E', 'M', '1303', 'y', 'H']
[EX A]: 1303

[EX Q]: ['q', '867', 'e', 'z']
[EX A]: 867

[EX Q]: ['4235', 'P', 'y', '8217', 'R', '2367', 'R']
[EX A]:
14819