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.

['7361', '6913', '3605', '2081', '7619']
27579

['a', 'j', 'v', '619', 't', 'a', '5777', 'x', 'R', 'P', '8897', 'j']
15293

['6419', 'w', 'M', '4325']

10744