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.
['M', '225', 'f', '7623', 'A', '7415', 'Y', '5061', 'd', 'G', '6015', 'J', '9081', '9967', 'I', 'U', '4341', 'F']