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.

['s', 'g', 'Z', '8919', 'R']
8919

['E', 'y']
0

['t', 'W', '9453', 'E', 'Q', '4295', '7669', 'f', 'C', 'h', '8517', '2029']

31963