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.
--------
Question: ['457', '173', '6807', 'o', '555', 'l', 's', 'Z', 'm', '3035', '1283', '5645', 'S', '8641', 'J', 'Z', 'z', 'K']

Answer: 26596


Question: ['y', 'p', '3553', '2155', 'b', 'R', 'j', 'V', 'U']

Answer: 5708


Question: ['d', 'X']

Answer:
0