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.

['Y', 'X', 'd', 'N', '1877', '2865', 'M', '1249', '9385', 'v', 'o', 'P', 'P', '6029']
21405

['G', 'Z', '4819', '9763', '9987']
24569

['7849', '6061', 'L', 'T', '763', '5733', 'R', 'D', '9625', '7311', 'z', '2391']

39733