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]: ['D', 'R', 'Y', '4929', 'P', '7929']
[A]: 12858


[Q]: ['4089', '2385', 'E', 'K', '259', '295', '6649', '8645', 'n', '2577', '2683', '9041', 'Q', 'm', '4237']
[A]: 40860


[Q]: ['5829', 'A', 'O', '9311', 'P', 'K', '1187', '2555', 'M']
[A]:
18882