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: ['z', 'c', 'E', 'Q', '1839', 'g', 'X', 'c', '291', 'c', 'w', 'e', '5957', 'X', '6471', 'A', '8359', 'y', '3611', '5417']

Answer: 31945


Question: ['7187', '5651', 'd', '4869', 'q', '2375', '3547']

Answer: 23629


Question: ['259', '8477', '6409', 'm', 'k', '4993', 'r', '9707', '5879', '8221', 'z', 'l', 'i', '5371', '5785']

Answer:
55101