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: ['Z', '6245', 'N', '1403', 'b']

A: 7648
****
Q: ['457', '173', '6807', 'o', '555', 'l', 's', 'Z', 'm', '3035', '1283', '5645', 'S', '8641', 'J', 'Z', 'z', 'K']

A: 26596
****
Q: ['s', '6979', '5225', '2165', '9457', '6243', '6033', 'L', '6233', '6419', 'o', 'k', '6219', 'f', 'C', '6669', 'X', 'C', '6329', '5831']

A:
73802
****