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: ['6469', '3027', 'Z', '3353', 'a', 'S', '3879', '8471', 'H', 'I', 'y', '2661', '9007', 'D']

A: 36867
****
Q: ['6551', 'm', '3941', 'F', 'K', 'u', '7981', '9581', 'X', 'M', 'N', 'e', 'G', 'i']

A: 28054
****
Q: ['g', '77', 'A', '6827']

A:
6904
****