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

Output: 48859


Input: Consider Input: ['6565', 'T', 'O', '2901', '5121', 'y', '9617', 't', '7825']

Output: 32029


Input: Consider Input: ['s', '5031', 'd', 'B', '6957', '9921']


Output: 21909