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]: ['r', '3139', 'C', 'L', '7335', 'v', '9861', 'F']
[A]: 20335


[Q]: ['z', 'T', 'Y', 's', 'j', '585', '7833', '2601', '8057', 'S', '7037', '5799', '4477', '5377', '6301', 'P', 'm', '9431', 'f']
[A]: 57498


[Q]: ['v', 'I', 'a', 'i', '2373', '5405', '7409', '5777', 'i', '137', '4625', '365', '4701', 'Y', 'g', '8955', 'W', '3617', 'P', 'C']
[A]:
43364