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]: ['6469', '3027', 'Z', '3353', 'a', 'S', '3879', '8471', 'H', 'I', 'y', '2661', '9007', 'D']
[EX A]: 36867

[EX Q]: ['1969', 'm', 'Y', 'N', '7331', 'J', 'b', '2485', 'x']
[EX A]: 11785

[EX Q]: ['3255', 'k', 'W', '6603', '1219', '1405']
[EX A]:
12482