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]: ['x', '9895', 'r', 'H', 'C']
[A]: 9895


[Q]: ['P', '237', 'X', '8893', '7931', 'F', '8359', 'S', '6931', '6953', 'r']
[A]: 39304


[Q]: ['8081', '6043', 'Z', 'F', 'O', 'P', '7657', '69', '3357', 'X']
[A]:
25207