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]: ['3121', 'j']
[A]: 3121


[Q]: ['7361', '3605', 'V', '2039', '9665', 'X', 'b', '1195', '657', '6509', '7195', '2013', '1847', 'v', '9499', '1761']
[A]: 53346


[Q]: ['m', 's', '5421']
[A]:
5421