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]: ['D', 'b', 'h', 'p', '1637']
[EX A]: 1637

[EX Q]: ['507', 'P', '9697', 'u', '5057']
[EX A]: 15261

[EX Q]: ['L', '7199']
[EX A]:
7199