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]: ['6731', 'f', '4561', '5601', 'i']
[A]: 16893


[Q]: ['6051', '5303', '1509', '2797', 'Z', '4777', '721', '8563', 'K', '63', '9115', 'd', '7305', '9743', '7409']
[A]: 63356


[Q]: ['L', 'G', '2199', '3995', '47', 'D', 'n']
[A]:
6241