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.

['k', 'Z', 'r', 'K', 'b', 'X', 'A']
0

['3655', '1349', '6519', '1019', 'v', '4811', '8609', '9147', '8225', '2665', '2627', '5839']
54465

['T', 'k', 'i', '1557', '9869', 'f', '7025', 'f']

18451