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.

[Q]: ['D', '1693', 'f', 'B', 'o', '3947', '8667', 'f', '6721', '4191', '79']
[A]: 25298


[Q]: ['I', '7815']
[A]: 7815


[Q]: ['H', '9771', 'j', 'J', '2127', 'Y', 't', 'N', '5533', '8763', 'N', '4951', 'L', 'i', 'v', 'r', 'B', 'P']
[A]:
31145