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: ['4271', 'N', 'M', '5239', '7037', 'x', 'U', 's', '7107', '4163', 'f', '3607', '6155']

Answer: 37579


Question: ['5347', 'E', 'a', '5379', '405', '1171', 'v', 'J']

Answer: 12302


Question: ['855', 'g', '8081', 'G', '3253', '9971', 'x', '7613', '1295', '6825', '2187', '7339', 'n', '589', '3955', 'b', 'd', 'q', '4119', '1435']

Answer:
57517