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: ['T', 'n', '8513', '5565', '6343', '1403', '975', '6959', '8049', '1601', 'j', 'Q', 'O', '7889', 'r', 'D', '1903', '6607']

A: 55807
****
Q: ['R', 'J', 'z', 'o', '1121', '7247', '8987', 'u']

A: 17355
****
Q: ['a', 'C', '7489', '3239', 'Q', 'L', 'K', 'R', '2107', 't', '1321', 'F', '4415', '8043', '8137']

A:
34751
****