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: ['N', 'V', 't', 'X', 't', 'M']

A: 0
****
Q: ['M', 'F', '4477', '1565', '4407', 'r', 'v', '7237', '83', '5243', 'O', 'z', 'W', '7703', 'Q', 'i', '9657', 'n']

A: 40372
****
Q: ['6421', 'X', 'p', '6213', '959', '4155', '2305', 'T', 'a', 'G', 't', 'a', 'i', '193', '6803']

A:
27049
****