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]: ['7231', '2813', '51', '1745', 'c', 'a', '4929', '3185', '5707', '2095', 'f', 'S']
[A]: 27756


[Q]: ['d', 'k', 'l', '4523', '2811', '1759', 'G', 'o', '5979', 'F', '8605', '2985']
[A]:
26662