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]: ['5347', 'E', 'a', '5379', '405', '1171', 'v', 'J']
[EX A]: 12302

[EX Q]: ['3433', '6955', 'Q', 'E', '3557', 'S', '2931', '9879', 'S', 'f', 'Q']
[EX A]: 26755

[EX Q]: ['5203', 'w', '6749']
[EX A]:
11952