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.
--------
Question: ['z', 'j', 'M', 'E', '1689', '8413', '2603', 'b', '5101', 'w', 'r']

Answer: 17806


Question: ['9403', '2607', 'G', '7901', 'K', '7967', 'a', 'n', '1967', 'x', 'g', '1081']

Answer: 30926


Question: ['w', 'u', 'i', '6935', '8653', '583', 'R', '5029', 'R']

Answer:
21200