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.

[Q]: ['5215', 'c', '839', 'V']
[A]: 6054


[Q]: ['2325', '3259', '1947', '8065', 'H', '2329', 'h', 'l', 'k', 'R']
[A]: 17925


[Q]: ['s', '3411', '3901', 'D', '5459', 'r', '1493', '3513', 'v', 'e', 'Y']
[A]:
17777