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.

Q: ['7231', '2813', '51', '1745', 'c', 'a', '4929', '3185', '5707', '2095', 'f', 'S']

A: 27756
****
Q: ['8669', '9115', '2573', '9261']

A: 29618
****
Q: ['7257', '9829', '6119', 'K']

A:
23205
****