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]: ['k', 'a']
[EX A]: 0

[EX Q]: ['D', '5207', 'E', '119', 'g', '2991', 'G', 'g', 'u']
[EX A]: 8317

[EX Q]: ['1671', '2977', 'A', 'T', '637', '3383', 'T', 'U', 'P', '7055', 'P']
[EX A]:
15723