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]: ['l', 'V']
[EX A]: 0

[EX Q]: ['2787', 'z', '9351', '3339']
[EX A]: 15477

[EX Q]: ['3235', '5247', '8205', 'j', 'R', '9123', 'r', 'O', '1933', '8261', '4315', '1533', 'S']
[EX A]:
41852