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]: ['v', 't', 'a', 'r', 'O', 'I']
[A]: 0


[Q]: ['e', '6633', '131', '7459', '3733']
[A]: 17956


[Q]: ['1947', 'v', 'g', '8859', '1969', 'Z']
[A]:
12775