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: ['6577', 'Q', '6865', '7671', 'N']

A: 21113
****
Q: ['4241', 'E', '1807', '2877', '5125', '7625', 'S', '401', '5081', 'u', 'R', 'F']

A: 27157
****
Q: ['4647', '8741', 't', '3583', '8971']

A:
25942
****