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.
['t', 'E', 'o', 'A', 'F', '6023', '9779', '2115', 'R', 'c', '9165', 'N', 'g', 'z', 'O', '5101', '6451', 'd']