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]: ['3705', '9217', 'C', '4609']
[EX A]: 17531

[EX Q]: ['u', 'i', 'z', 't', '9617', 'd', '3255', 'w', 'S', '3041', '7451']
[EX A]: 23364

[EX Q]: ['6573', 'Y', '4905', '5817', '5473', 'W', '6949', '3097', '5803', 'V']
[EX A]:
38617