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: ['q', 'Y', '6021', '4045']

Answer: 10066


Question: ['r', 'B', '8791', '3165', 'n', 'm']

Answer: 11956


Question: ['S', 'W', 'x', 'f', 'I', 'g', 'H', '6319', 'Q', '8933', '9591', 'D', 'H']

Answer:
24843