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]: ['6161', 'p', '2839', 'c', '5905', '1729', 'j', '5901', '3013', 'e']
[EX A]: 25548

[EX Q]: ['5899', '229', 'm', '3347', 'k', 'q', 'g', '2755', '8727', '2035', '823', '6835', '9271', 'Q']
[EX A]: 39921

[EX Q]: ['2087', '8171', 'c', 'd', 'a', '5621', 'n']
[EX A]:
15879