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: ['2787', 'z', '9351', '3339']

A: 15477
****
Q: ['7459', '4723', 'N', '8573', '3947']

A:
24702
****