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]: ['901', '1939', '7637', '8863', 'X', '5003', '8791', '4757', 'E', '1525', 'y', '9735']
[A]: 49151


[Q]: ['c', '4501', 'O']
[A]: 4501


[Q]: ['c', 'a', '2283', '2281', 'K', '8415', '5103']
[A]:
18082