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


[Q]: ['S', 'W', '2171', '6405', 'h', 'C', '1597', '7109', 'Q', 'p', '2747', 't', 'J', 'q', '1883', 'v', 'O']
[A]: 21912


[Q]: ['2637', '5515', '9489', '613', '7931', '1927', 'G', 'X', 'A', 's', 'M', '3365']
[A]:
31477