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]: ['1073', 'i', 'o', 'j', 'O', 'g', 'X', '3261', '5105', '4831', 'J']
[EX A]: 14270

[EX Q]: ['8683', 'p', '47', '8983', 'g', 'u']
[EX A]: 17713

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