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]: ['3331', '5791', 'r', 'Q', '2243', '8229']
[A]: 19594


[Q]: ['O', 'K', 's', 'V', '6815', 'c', '9277', 'V', '1783', 'b', 'i', '2045', 'E', 'E', '2035']
[A]: 21955


[Q]: ['4235', 'P', 'M', 'Y']
[A]:
4235