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.

['2577', 'B', '3059', 'S', 'l', 'T', 'Q', 'x', 'f', 'l', 'y']
5636

['X', 'P', 'x', '9471', '5', 'c', 'f', '5077', '1085', '2267', 'R', 'q', '4987', '9529', 'H', 'n', 'r', 'u']
32421

['r', '235', '7119', 'P', '825', '479', 'q', 'k', 'R', 'L', '1697', 'F', 'L', '1091', 'z', 'L', 'H', 'M', 'R']

11446