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]: ['3723', 'v', 'j', 'e', '2017', 'd', '4211', '2079']
[EX A]: 12030

[EX Q]: ['n', 'u', '9595', 'M', 'o', 'K', '5073', 'x']
[EX A]: 14668

[EX Q]: ['d', 'x', 'y', 'c', 'I', 'q', '8969', 'S', '171', '8441', 't']
[EX A]:
17581