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.

['z', '3199', 'r', '849', 'C', 'v', '1931', 'M', 'Q', '4531', '579', 'x', '8997', '4663']
24749

['a', 'j', 'v', '619', 't', 'a', '5777', 'x', 'R', 'P', '8897', 'j']
15293

['5399', 'c', 'l', 'F', '2853', 'x', '7287', '7563', 'o', '4713']

27815