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]: ['8739', 'K']
[EX A]: 8739

[EX Q]: ['2787', '3361', '7167', '3369', 'b']
[EX A]:
16684