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

[EX Q]: ['5829', '9755', '67', 'F', '6347', 'p', 'i', 'X', 'z', 'o', '2321', 'F', '6145', 'B', '3903']
[EX A]: 34367

[EX Q]: ['8693', '5307', 'I']
[EX A]:
14000