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: ['2691', '3861', '7087', '4661', '6527']

A: 24827
****
Q: ['3145', 'C', '7725', 'k', 'z']

A: 10870
****
Q: ['7877', 'e', 'k', '8335', 'A', '1427', 'U', '6295', '9327', '8999', 'Z', '1639', '521']

A:
44420
****