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.
['X', 'Q', 'I', '415', '6827', 'T', '1089', '7279', '2085', '5625', 'p', 'j', 'a', '7295', 'E', 'x', 'l', 'M']