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.

['v', 't', 'a', 'r', 'O', 'I']
0

['c', '7415', '6253', '4477', 't', '9449', '7733', '2325', 'Z', '5413', 'q', 'm', 'R', '8619', '7289', '857', '7273', '7425']
74528

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

57498