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]: ['q', '8155', 'L', 'v', '2657', 'X', 'v', '2353', '151', 'R', '967', '4327']
[EX A]: 18610

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

[EX Q]: ['D', '4955', 'O', '8687', '9507', 'v', 'j', 'R']
[EX A]:
23149