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]: ['N', '1337', 'C', 'T', '863', 'j', '2369', 'P', 'A', 'x', '5725', '2333', 'Q', '9149', 'Q', '8529', 'N']
[A]: 30305


[Q]: ['5215', 'c', '839', 'V']
[A]: 6054


[Q]: ['7813', 'H', '3617', '4273', 'Q', 'O', 'K', '1103']
[A]:
16806