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]: ['5233', 'i', 'Z', 'v', '4531', 'j', '61', '1725', '5915', '1677', 'F', 'K', 'M', 'Z']
[EX A]: 19142

[EX Q]: ['2225', '1925']
[EX A]: 4150

[EX Q]: ['b', 'w', 'H', 'r', 'c', 'h', 'f', '1387', '483', 'o', '871']
[EX A]:
2741