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.

['6645', 'k', '4879', 'N', '113', 'L', 'x', '8365', 'v', 'A']
20002

['P', '6161', 'k', '5925', 'h', 'G', 'n']
12086

['9681', 'C', '7653', 'A', '161', '7167', '3041', '3457', 'o', 'W']

31160