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.

['x', 'd', '5121', 'I', '6737', '3789', '6167', 'C', '8947', 'k', '4715', '1885', 'H', 'B', '5685', 'S', '4615', 's', '7709']
55370

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

['I', 'x', '6899', 'A', 'J', '7743', 'x', 'D', '1837', 'X', '5655', '2581', '3979', '5219', 'j']

33913