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: ['T', '8333', 'C', 'Z', 'n', '1419', 'd', '3205', 'D', '1187', 'd']
Example Output: 14144

Example Input: ['4701', 'b', 'i', 'B', 'z', '7837', 'W']
Example Output: 12538

Example Input: ['C', 'w', 'g', '4513', '7967', '6861', '7981', '6381', '5057', 't', 'k', 'l', '3767', '7297', 'Z', '9943', 'D', 'Z']
Example Output:
59767