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.

Input: Consider Input: ['D', '7807', '9395', 'T', 'c', '5139', '2827', 't', 'T', 'm', '3717', 'U', '3225', '7419', '2481', 'p', 'C', '5277']

Output: 47287

Input: Consider Input: ['291', 'R', 'N', '983', '2879', 'C', '3797', '4837', '793', '5489', 'k', '535', 'L', '3605', 's', '3701', 'U', '4399', '2489', '4739']

Output: 38537

Input: Consider Input: ['t', '5445', '8847', '6421', 't', '157', 'D', '6083', 'L', '187', 'z', 'i', '6547', '2161', '6331', '3343', '7283', '5691', 'k']
Output: 58496