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', '721', '6555', 'g', 'y', 'U', '3053', 'A', '9663']
19992

['Q', '2271', '1803', '2363']
6437

['1671', 'H', '9271']

10942