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]: ['K', 'O', 'p', '1669', '8647', '3417', 'a', '8903', 'V', 'E', 'l', 'a', '5177', 'J', '6559', '5377', 'X', '9427']
[A]: 49176


[Q]: ['3883', 'T', '6175', 'B', '4365', '3719', 'V', 'B', '3173', 'K', 'Z']
[A]: 21315


[Q]: ['645', '3681', 'Q', 'z', '3549', 'y', 'k', 'K', 'H', '411', '4315', 'p', '2643', 'R', '5943', 'E', 'u', 's', '301', 'L']
[A]:
21488