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]: ['d', '7305', '8903', 'b', '7687', '6393', '6939']
[A]: 37227


[Q]: ['6217', 'A', '1925', 'o', '1433']
[A]: 9575


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