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


[Q]: ['597', 'i', 'd', '3201', 'u', '1111', '8563', 'c', 'E', '5983', '6293']
[A]: 25748


[Q]: ['3139', '3849', '1299', 'w', '5517', 'y', '7339', 'z', '9077']
[A]:
30220