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]: ['O', 'j', 'Z', 'u', '7427', '4225', '3139', '9993', '9945', '3639', 'h', 'j', 'f', '6511', 'e', '4607', '2741', '4743']
[A]: 56970


[Q]: ['1057', '3937']
[A]: 4994


[Q]: ['n', '5297', 'l', 's', 'R', '5801', '1241', '1793', 'o', '6815', 'e', '571', '8817']
[A]:
30335