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: ['5215', 'c', '839', 'V']

A: 6054
****
Q: ['5233', 'i', 'Z', 'v', '4531', 'j', '61', '1725', '5915', '1677', 'F', 'K', 'M', 'Z']

A: 19142
****
Q: ['6075', '3665', '8687', 'W', 'y']

A:
18427
****