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.

['7293', '2619', '2459', '3829', 'J', 'c', 'a', 'a', '311', 'x', 'r', '6123', '2847', '4809']
30290

['7067', 'E', 'C', '1879', 'Z', 'u', 't', '2053', '6769', 'r', '5207', '7009', 'H', '5587', 'i', 'M', '1357', 'A']
36928

['J', '5393', 'U', 'I']

5393