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: ['W', '3561', '4631', '8379', 'W', '6857', '2723', '5393', 'h', 'g', 't', 'I', 'R', '2321', 'l']

A: 33865
****
Q: ['Q', '1767', '5523', 'I', '933', 'h', '2189', 'f', '7795', 'X', 'M', 'G', '1215', 'W', '8619']

A: 28041
****
Q: ['Z', 'E', '9287', 'L', 'y']

A:
9287
****