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: ['6669', 'n', 't', 'N', 'x', '8153', 'W', 'v', 'B', '3181', 'y', 'e', '3491']

A: 21494
****
Q: ['r', '6537', '3001', '7879']

A: 17417
****
Q: ['4189', '3185', 'M', '4175', 'V', '1279', 'X', '3677', '4725', 'c', '5553', 'D', '2769']

A:
29552
****