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.

['7669', '3367', 'A', 'Z', '6173', '4391', 'f', 'S', '9657', '2631']
33888

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

['I', 'A', 'R', 'f', 'z']

0