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]: ['t', '7469', 'Y', 'N', '8137']
[A]: 15606


[Q]: ['u', 'e', 'P', 'D', '255', '2573', 'E', 'P', 's', '3725', '3391', 'I', '5323', '885']
[A]: 16152


[Q]: ['7255', 'S', 'L', 'N', '1591', '7131', '9611', '8391', '7625', '6009', 'F', '1379', '447', '885', 'i', 'v']
[A]:
50324