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.

['B', 'u', '9227', 'b', '8767']
17994

['M', 'F', '4477', '1565', '4407', 'r', 'v', '7237', '83', '5243', 'O', 'z', 'W', '7703', 'Q', 'i', '9657', 'n']
40372

['3043', '3647', 'T', 'y', 'Y', 'I', 'f', '7491', 'P', 'L', '2005', 'j', 'H', 'N', 'r']

16186