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]: ['6577', 'Q', '6865', '7671', 'N']
[A]: 21113


[Q]: ['339', 'h', 'd', '7449', 'e', 'u', '5055', '7029', '9009', 'G', 'U', '3', '441', '3273', 'K', '3827', '7069', 'x']
[A]: 43494


[Q]: ['709', '4295', 'O', 'v', '3637', 'E', '135', 'W', 'N', '4471', 'g']
[A]:
13247