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]: ['r', 'B', '8791', '3165', 'n', 'm']
[EX A]: 11956

[EX Q]: ['M', 'F', '4477', '1565', '4407', 'r', 'v', '7237', '83', '5243', 'O', 'z', 'W', '7703', 'Q', 'i', '9657', 'n']
[EX A]: 40372

[EX Q]: ['9895', '2047', '31', 'd', '7179', '4703', '5513', 'Q']
[EX A]:
29368