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]: ['W', 'c', 'P', '425', '4133', 's', '1831', '883', '2531', '681', 'U', 'B', 'H', '237', '4245']
[EX A]: 14966

[EX Q]: ['z', '9173', 's', '8937', 'h', '1881', '7929', 'b', '2441']
[EX A]: 30361

[EX Q]: ['S', 'z', '7395', 'V', '8091', 'F', 'h', 'X', '1107', 'z']
[EX A]:
16593