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]: ['1147', 'f']
[EX A]: 1147

[EX Q]: ['2087', '8171', 'c', 'd', 'a', '5621', 'n']
[EX A]: 15879

[EX Q]: ['e', '9165', '3975', 'a', 'N', '7385', '8163']
[EX A]:
28688