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.
--------
Question: ['A', '9775', '5867', 'n', '1329', '5973']

Answer: 22944


Question: ['W', 'O', 'c', 'r', 'E', 'w', '9811', '6421', '3543', '4293', '8255', 't', '229', '745', 'w', 'p', '6861', '5305', 'h']

Answer: 45463


Question: ['7941', 'b', '1651', 'X', 'i', 'H', '8839', '4923']

Answer:
23354