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: ['8739', 'K']

Output: 8739


Input: Consider Input: ['P', '6299', '9655', 'l', '6317', '2139', '3347', 'l', '3095', '7363', '3115', '7529', 'R']

Output: 48859


Input: Consider Input: ['d', '715', 'y', 'O', 'L', '6209', 'c', 'k']


Output: 6924