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]: ['1869', 'q', '5919', 'D', '7733', '2641', 'h', '1327']
[EX A]: 19489

[EX Q]: ['D', 'P', '9951', '2897', 'V', 'C', 'B', 'H', 'c', 'h', '2843', 'a']
[EX A]: 15691

[EX Q]: ['6987', 'Y', '1251', 'R', 'm', '7385', '4467', '1169']
[EX A]:
21259