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.

[EX Q]: ['4201', '6445', '4009', 'q']
[EX A]: 14655

[EX Q]: ['D', '1259', '8927', '3345', '553', '7209', '2507', 'l', 'o', '7317', '1227', '6749', 'S', '3171', 'I', '197', '9577', 'j', 'Q']
[EX A]: 52038

[EX Q]: ['8763', '9225', 'Z', 'L', 'W', '7833']
[EX A]:
25821