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: ['k', '6555', 'L', '7549', 'W', 'y', 'y', '8817', 'J', 't', 'X', 'M', 'N', 'G', '7441', '283']

Answer: 30645


Question: ['3895', 's', 'j', '7755', 'H', '7941', '4903', 's', '3629', '1183', '1001', '5569', 'q', '4735']

Answer: 40611


Question: ['k', '1477', 'W', '9049', '8615', 'x', '7301', '4361', '5525', '8879', 'T', '9551', 'M', '9579', '4443', '2869', 'y', 'o', '8163']

Answer:
79812