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.

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

[EX Q]: ['g', '5301']
[EX A]: 5301

[EX Q]: ['549', 'D', '4453', 'j', '2485', '6707', '6831', 'l', '3127', 'C', '6295', 'P']
[EX A]:
30447