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.

['k', 'Z', 'r', 'K', 'b', 'X', 'A']
0

['7335', '813', '6461', '8903', '3709', 'V', 'G', 'I', 'P', 'p', 's', 'v', 'R', '4697', '4263', '9897']
46078

['F', 'a', 'M', '4611', 'F', 'w', '7717', '7787', 'd', '5439', '1423', '5667', 'O', 'h', 'R', '3025', '2101', 'n', '863']

38633