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]: ['X', '989', 'U', '9551', '6385', 'Y', '1433', 'J', '1833', '685', 'u']
[A]: 20876


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


[Q]: ['8445', 'f', '4933', 'G', '789', '2393', '8619', 'I', '1391', '9393', '5283']
[A]:
41246