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.

Example Input: ['1395', '3605', '6001', 's', 'h', 'T', 'K', 'X', '9413', 'X', '5099', 'c', 'f', 't', 'S', 'f', '4651']
Example Output: 30164

Example Input: ['b', '5447', 'R', '8489', 'L', '627', 'P', '7491', 'c', 'c', 'r', '6923', '1167']
Example Output: 30144

Example Input: ['9177', '455', '8791', '7359', '6297', 't', '6833', '9609', 'b', 'M', 'D', '233', 'U', '8551', 'U', 'u', 'V', '963', '5377']
Example Output:
63645