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: ['W', 'c', 'P', '425', '4133', 's', '1831', '883', '2531', '681', 'U', 'B', 'H', '237', '4245']

A: 14966
****
Q: ['v', 't', 'a', 'r', 'O', 'I']

A: 0
****
Q: ['7101', '803', '7321', 'f', '3273', '2671', '4743', '445', 'b', '8811']

A:
35168
****