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]: ['6019', '1467', '3415', '7785']
[EX A]: 18686

[EX Q]: ['s', 'd', 't', '8235', '2279', '7477', '3029', '4377', '9153', '4309', '2295', '407']
[EX A]: 41561

[EX Q]: ['v', '2743', 'p', '9727']
[EX A]:
12470