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

['I', 'n', '3069', '477', 'F', 'k', '847', '6777', 'N', 'X', 'F', '1417', '9445', 'o', 'v', 'd', '2169', 'w']
24201

['k', 'Z', 'r', 'K', 'b', 'X', 'A']

0