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]: ['Q', 'v', 't', '223', 'm', 'l', 'c', 'M', 'b', '2227', 'P', 'e', 'n', 'f', 'S', '2205', '3517', '5545']
[EX A]: 13717

[EX Q]: ['i', 'A', 'a']
[EX A]: 0

[EX Q]: ['5543', '7375', 'e', 'B']
[EX A]:
12918