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.

['773', 'e', '4451', 'S', 'I', 'r', 'e', 'V', 'Q', 'g', 'J', 'L', '7655', 'O']
12879

['6001', '6423', '5591', '8721', 't', 'x', '3723', 'E', 'F', '7353', 'b']
37812

['Q', 'b', 'Y', '2685', '187', 'z', '1611', '6371', '8197', 'l', 'I']

19051