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.

[Q]: ['s', 'M', 'U', '5383']
[A]: 5383


[Q]: ['7459', '491', '7823', '6965', 'H', '109', 'R', 't', '3959', '2821', 'R', '2807', 'o', 'v', '1305', 'a', '1411', 'r', '3669']
[A]: 38819


[Q]: ['871', '9105', '5035', '3539', '6001']
[A]:
24551