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]: ['8591', 'J', 'l', 'l', '7023', 'N', 'n']
[EX A]: 15614

[EX Q]: ['1709', 'S', 'w', '7725', 'Z', '7755', '8081', '897', 'N', '4449', 'F', 'F', 'M', 'y', 'B', 'h', 's', 'l', 's', '415']
[EX A]: 31031

[EX Q]: ['3225', 'D']
[EX A]:
3225