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]: ['s', '425', '6135']
[EX A]: 6560

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

[EX Q]: ['P', '965', 'p', 'u', 'y', 'a', '6173', '903', 'F', 'x', 'E', 's']
[EX A]:
8041