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]: ['3145', 'C', '7725', 'k', 'z']
[A]: 10870


[Q]: ['S', '1249', '6233', 'I', '6733', 'r', 'A', 'E', 'h', 'x', 'p', 'c', '515', '1029', '1593', '1035']
[A]: 18387


[Q]: ['6841', 'o', '8843', '7885', 'T', '9797', 't', 'S', 'H', '7693', 'Q', 'U']
[A]:
41059