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: ['507', 'P', '9697', 'u', '5057']

A: 15261
****
Q: ['4389', '8535', 'D', '6063', 'z', 'r', 'w', '5725', '291', 'a', '9059', '569', '2943', 'W']

A: 37574
****
Q: ['b', 'C', '4609', '4927', '631', '7205', '7293', 'M', 'w', '1301', 'S', 'E', 's', '3803', 'w', '8639', 'p']

A:
38408
****