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]: ['7231', '2813', '51', '1745', 'c', 'a', '4929', '3185', '5707', '2095', 'f', 'S']
[A]: 27756


[Q]: ['R', 'C', 'S', 'x', '1529', 'r']
[A]: 1529


[Q]: ['4125', '3531', 'c', '6441', 'T', 'J', '9355', '8469', '4177', '1011', '7147', 'i', 't', '4303']
[A]:
48559