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]: ['s', '9377', '3663', '1375', 'j', 'L', '7943', '1711', '7409', '9115', '1227', 'I', 'U']
[EX A]: 41820

[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]: ['a', 'g', 'C', 'L', '1287', '2145', '3643', 'z', 'W', '9503', 'z']
[EX A]:
16578