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.

['m', 'g', '7251', '5873', '59', '7345']
20528

['3469', 'n', '5561', '8597', '921', '4737', 'r', 'P', '7127', '3651', 'D', '1703', 'y']
35766

['v', 'F', '1035', 'W', 'B', 'j', 'B', 'x', 'N', 'U', 't', 'I', 'q', 'k']

1035