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]: ['2787', '6085', '6989']
[A]: 15861


[Q]: ['z', 'T', 'Y', 's', 'j', '585', '7833', '2601', '8057', 'S', '7037', '5799', '4477', '5377', '6301', 'P', 'm', '9431', 'f']
[A]: 57498


[Q]: ['F', 'H', '4429', '947', '4391', '9373', 'a', '3653', 'm', '5901', 'R', '2627', 'C']
[A]:
31321