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]: ['7087', 'P', 'i', 'e', '4875', 'e', 'F']
[EX A]: 11962

[EX Q]: ['t', 'x', '5629', 'k', '2003', 'v', '541', 'l', 'v', '7983', '677', '6173', 'z', 'J', 's', 'u', '2187', 'Y']
[EX A]: 25193

[EX Q]: ['h', 'g', '3519']
[EX A]:
3519