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

[EX Q]: ['3145', 'C', '7725', 'k', 'z']
[EX A]: 10870

[EX Q]: ['1733', 'm', '6841', 'v', 'Z', '6817', '8969', 'w']
[EX A]:
24360