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.

['1391', '1719', '8547', 'x', 'a', 'j', '6395', 't', '3421', '6607', 'M', '1645', 'H', 'x', 't']
29725

['u', 'e', 'P', 'D', '255', '2573', 'E', 'P', 's', '3725', '3391', 'I', '5323', '885']
16152

['J', '7363', '8223', '5853']

21439