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]: ['3883', 'T', '6175', 'B', '4365', '3719', 'V', 'B', '3173', 'K', 'Z']
[EX A]: 21315

[EX Q]: ['r', '6537', '3001', '7879']
[EX A]: 17417

[EX Q]: ['2425', 'q', 'q', '8597', 'h', 'L', 'X']
[EX A]:
11022

