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]: ['9903', 'H', '757', 'J', '6481', '9789', 'H', '3285', 'V', 'X', '5229', '7197']
[EX A]: 42641

[EX Q]: ['7831', 'O', '6017', 'v', 'U', '5761', 'Q', 'Q', 'w', '8465', 'Z', 'P', 'i', 'u', '1635', 'n', '8471', '4213']
[EX A]: 42393

[EX Q]: ['d', '2453', 'Y', 'k', 'V', 'F', '9285', '6305']
[EX A]:
18043