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.

['b', 'i', '7807', 'g', '1611', '6733', 'V', '561', 'C', '8575', 's', 'E', '8129', 'F']
33416

['1391', '1719', '8547', 'x', 'a', 'j', '6395', 't', '3421', '6607', 'M', '1645', 'H', 'x', 't']
29725

['3121', '8751', '4439', '2655', '8975']

27941