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.

['4701', 'b', 'i', 'B', 'z', '7837', 'W']
12538

['4509', '4165', '8651', '8057', 'a', '2241', 't', 'i', 'q', 'S', '5149', 'J', 'j', '1373', 'W', 'X', '235', 'm', '3225']
37605

['U', '1919', 'S', '6083', '1647', '6195', 'Q', '1433', '8397', 'L', 'S', '2067']

27741