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]: ['P', '6299', '9655', 'l', '6317', '2139', '3347', 'l', '3095', '7363', '3115', '7529', 'R']
[EX A]: 48859

[EX Q]: ['H', '1963', '2917', '6245', 'Z', 'J', 'e', '6805', 'T', '485', 'D', 'L', 'z', 'r']
[EX A]:
18415