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]: ['7669', '3367', 'A', 'Z', '6173', '4391', 'f', 'S', '9657', '2631']
[EX A]: 33888

[EX Q]: ['4389', '8535', 'D', '6063', 'z', 'r', 'w', '5725', '291', 'a', '9059', '569', '2943', 'W']
[EX A]: 37574

[EX Q]: ['1093', 'c', 'w', '335', 'k', 'V', '489', 'J', 'K', 'x', 'U', 'o']
[EX A]:
1917