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]: ['8361', '6757', '5341', '2597', '9803', 'a', 'd', '5889', '9823', 'd', '7947', 'y', 'p']
[EX A]: 56518

[EX Q]: ['251', '2155', '5029', 'k', 'j', 'I']
[EX A]: 7435

[EX Q]: ['c', 'N', '5025', '8753', '6953', 'B', 'L']
[EX A]:
20731