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]: ['4425', 'x', '1959', 'C', 'c', 'D', 'M', '8317', 'q', 'x', '4277', 'N', 'z', 'I', '1921', 'o', 't']
[A]: 20899


[Q]: ['7763', '6003', 'V']
[A]: 13766


[Q]: ['1713', '3543', '803', '6215', 'L', '2191', 'l', 'K', '9217', 'T', '3855', '7023']
[A]:
34560