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]: ['8109', '5635', 'u', 'M', '1009']
[A]: 14753

[Q]: ['6941', 'I', 'j', '6135', '6525', '7853', '5607']
[A]: 33061

[Q]: ['r', 'F', '4355', 'C', '3401', '7441', '3465', 'T', 'm', 'K']
[A]:
18662