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.

['6669', 'n', 't', 'N', 'x', '8153', 'W', 'v', 'B', '3181', 'y', 'e', '3491']
21494

['q', '8155', 'L', 'v', '2657', 'X', 'v', '2353', '151', 'R', '967', '4327']
18610

['T', '3405', 'z', 'l', '8179', '8621', '9499', '6679', '7815', 's', '5955', 'E', '1515', 'c', 'E', 'R', '1489', 'O', '3433']

56590