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: ['4949', '2459', 'n', 'f', 'n', 'v', '8421', '1519', '4859', 'c', '9923', '2829', 'K', '4937', 'W', 'R']

Output: 39896


Input: Consider Input: ['7361', '6913', '3605', '2081', '7619']

Output: 27579


Input: Consider Input: ['E', 'm', '3799', 'A', '7387', '2341', 's', '6579', 't', 'N', 'K', '2095', '7055', 'l', '667']


Output: 29923