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.

['v', '3135', 'J', 'm', 'a']
3135

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

['c', 'v', 'o', 'W', '2905', 'x', '7779', 'G', 'a', '8767', '8873', '8445']

36769