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]: ['R', '3361', 'c', 'S', 'g', '3829', '7347', '6633', 'e', '9227']
[A]: 30397


[Q]: ['o', '7099', 'G', 'v', 'H', 'J', 'k', '1607', 'i', '9765', '2489', '8031']
[A]: 28991


[Q]: ['D', '7857', 's', 'R']
[A]:
7857