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]: ['2325', '3259', '1947', '8065', 'H', '2329', 'h', 'l', 'k', 'R']
[A]: 17925


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


[Q]: ['U', '9319', '7409', '9939', '1433', '3419', '6001', '8157', '8897', 'P', '809', '1503', '2937', '6745', 'h', 'B', 'Z', '2369']
[A]:
68937