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]: ['Q', '1669']
[EX A]: 1669

[EX Q]: ['8109', '5635', 'u', 'M', '1009']
[EX A]: 14753

[EX Q]: ['4839', 'i', 'u', 'I', 'B', '363', '5785', 'R', 'j', 'X', 'M', 'F', '5913']
[EX A]:
16900