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.

['7215', 'd', 'q', 'k', '9301', 'P', 'x', 'C', 'g', 'e', 'o', '2769', '6993', '9769', 'v', '9007', '4131', '8627', 'q']
57812

['D', 'R', 'Y', '4929', 'P', '7929']
12858

['x', 'X', '31', 'X', '3017', '1247', '6707', 'K', '1371', '951', '8657', 'k', 'K', '4177', '4247']

30405