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', 'p', '97', 'R', '2999', 'u', '7307', '6033', '6431', 'm', 'T']
[A]: 22867


[Q]: ['5347', 'E', 'a', '5379', '405', '1171', 'v', 'J']
[A]: 12302


[Q]: ['3555', 'N', '995', '3881', '3603', '7783']
[A]:
19817