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]: ['8683', 'p', '47', '8983', 'g', 'u']
[A]: 17713


[Q]: ['A', 'S', 'c', 'I', 'M', 'P', '8739', '879', '1401', '3941', '4061', 'q', 'P', '2805', '4473']
[A]: 26299


[Q]: ['5505', '4723', 'j', '1187', '4393', 'R', 'R', 'Z', '4873', 'p', '5059', 'G']
[A]:
25740