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]: ['3433', '6955', 'Q', 'E', '3557', 'S', '2931', '9879', 'S', 'f', 'Q']
[A]: 26755


[Q]: ['o', 'a', 'K', '6031']
[A]: 6031


[Q]: ['D', '8957', '2491', '8339', '8327', 'k', '1207', '5769', '4663', '9523', '9589', '9497', 't', '1109', 'w', '9369']
[A]:
78840