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', '6153', 'A', '6173', 'x', '7527', '8501', 'g', 'r', 'K', 'I', '3103', '8347']
39804

['c', 'r', 'R', 'a', '6915', 'C', '3651', 'j', 'L', '9761', '2923', 'Z', 'e', '833', 'W', '1867', 'G', 'H', 'T']
25950

['7759', 'A', 'B', '4977', 'A', '2049']

14785