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]: ['N', 'e', '4283', '3243', '5581', '1407', 'q', 'y', '6685', 'v', 'c', '5995']
[EX A]: 27194

[EX Q]: ['6217', 'A', '1925', 'o', '1433']
[EX A]: 9575

[EX Q]: ['7703', 'x', 'z', '407', '5725']
[EX A]:
13835