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.

['W', '3561', '4631', '8379', 'W', '6857', '2723', '5393', 'h', 'g', 't', 'I', 'R', '2321', 'l']
33865

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

['w', '9155', 'H', '7647', 's', '2747', 'W', 'X', 'X', 'g', '5953', '6855', '9077', 'S', 'T', 'l', '7355', '6511']

55300