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.

['3451', '2325', '2511', 'i', '6159', '2291', 'e', 'l', 'P', '1177', 'o', 'T']
17914

['5499', '39', 'Q', 'b', 'W', '7155', '2515']
15208

['A', '8483']

8483