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]: ['E', 'y']
[EX A]: 0

[EX Q]: ['K', '9121', 'y', '4233', '1513', 'd', '5609', 'C', 'q', 'p', 'S', '627', 'q', 'I']
[EX A]: 21103

[EX Q]: ['x', 'Q', 't', '7491', 'P', 'W', 'L', 'w', 'g', 'q', '447']
[EX A]:
7938