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: ['8871', '1297', 'W', 'f', 'Y', '8731', '113', '6707', '379', '9631', 'X', 'C', 'q']

A: 35729
****
Q: ['7669', '3367', 'A', 'Z', '6173', '4391', 'f', 'S', '9657', '2631']

A: 33888
****
Q: ['4883', 'I', 'h', 'D']

A:
4883
****