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: ['5749', 'l', '3297', '8913', '4625', 'M', 'X', 'g', '3143', 'i', '8369', '6101', 'w', '3683', '3891', '1399', '9105', '6923', 'K']

Answer: 65198


Question: ['A', 'y', 'u', 'S']

Answer: 0


Question: ['k', 'v', '4021', 'X', '3297', '8101', '6789', '5399', '8881', '227', 'G', 'P', 'O', '5979', '7939', '8645', '7561', '5545', '9127']

Answer:
81511