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]: ['z', '447', '9781', 'R', '6083', 'u', '9229', 'Z', 'F', '2437', '9677', 'n', 'G', '6763', '5883', 'B', '9563', '4575']
[EX A]: 64438

[EX Q]: ['q', '5151', 'R', '441']
[EX A]: 5592

[EX Q]: ['7721', 'B', 'U', '1599', '9137', 'G', 't', 'O', '9333', '583']
[EX A]:
28373