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]: ['T', '721', '6555', 'g', 'y', 'U', '3053', 'A', '9663']
[EX A]: 19992

[EX Q]: ['29', 'N', '5061', '7191', 'z', '8367']
[EX A]: 20648

[EX Q]: ['4185', '4585', '5301', '1139', '5647', 'H']
[EX A]:
20857