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]: ['1147', 'f']
[EX A]: 1147

[EX Q]: ['8755', 'A', '2893', '6703']
[EX A]: 18351

[EX Q]: ['5579', '4533', 'p', '6507', '8089', '9707', 'J', 'I', '703', '3557', 'J', 'P', 'E']
[EX A]:
38675