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]: ['9989', 'B', 'E', '5181']
[A]: 15170


[Q]: ['M', '6989', 'I', 'w', '3591', '3067', '3883', 'C', '6049', '5723', 'j', '5989', 'C', 'R', '475', '7779', '671']
[A]: 44216


[Q]: ['N', '8143', '1279', '7011']
[A]:
16433