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.

['4401', 'p', 'V', 'l', 'H', '7329', 's', '4717', 'l', '1773', '67', '179', 'l', '6991', 'a', '9377']
34834

['2151', '7511']
9662

['i', '3741', '8305', 'K', '2591', 'Y', '6587', '6115', '5187', '7295', '7585', '389', 'c', '1081', '8577', '4481', '8397', 'L', '3437']

73768