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.

[EX Q]: ['k', '6555', 'L', '7549', 'W', 'y', 'y', '8817', 'J', 't', 'X', 'M', 'N', 'G', '7441', '283']
[EX A]: 30645

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

[EX Q]: ['8679', 'y']
[EX A]:
8679