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.

['6645', 'k', '4879', 'N', '113', 'L', 'x', '8365', 'v', 'A']
20002

['D', 'b', 'h', 'p', '1637']
1637

['y', '7929', '4075', '7057', 'z', 'Q', '6835', '7039', 'I', 'y', 'z', '2631', 'c', '7221', '6757']

49544