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.

['89', '5965', '9463', 'k']
15517

['5331', 'f', '2865', '6019', 'U', 'm', 'g', 'n', 'Y', 'A']
14215

['F', 'o', 't', 'b', 'v', '3365', 'd', '6977', 'H', '3163']

13505