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]: ['1875', '9833', 'i', '7493', 'J', 'P', 'z']
[A]: 19201


[Q]: ['135', 'a', 'X', '8067', '8447', '4009', '4221', 'o', 'A', 'x']
[A]: 24879


[Q]: ['5001', 'T', 'm', 'k', '2241', 'k', 'y', 'u', 'G', 'M']
[A]:
7242