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.

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

['q', 'I', 'E', 'M', 'T', 'i', '8719', 'r', 'V', '9759', 'I', '1793', 'Q', 'P', '5263', 'I', 'O', '8603', 'y']
34137

['f', 'H', '945', '2349', 'G', 'F', '8387', 'V', 'd', '4757']

16438