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: ['s', 'g', 'Z', '8919', 'R']

Output: 8919


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

Output: 39896


Input: Consider Input: ['8449', '8601', '7673', 'U', '3953', '3825', '4339', '6097', 'i', 't', '3771', '5707', '5735']


Output: 58150