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.

['q', 'U', 'I', '5245', 'g', 'Y', 's', 'V', 'b', 'V', 'D', '1193', 'p']
6438

['R', 'I', 'f', 'K', 'p', '8579', 'e', '1223', 'I', 'K', '8311', '2147', '4241', 'z', '6671', 'r']
31172

['2089', '6215', 'k']

8304