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: ['4241', 'E', '1807', '2877', '5125', '7625', 'S', '401', '5081', 'u', 'R', 'F']

Answer: 27157


Question: ['H', 'r', '713', 's', 'B', 'T', '9525', '679', 'M', '4089', 'Q', '223', 'H']

Answer:
15229