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: ['r', '2251', 'X', 'H', 'a', '5463', 'g', 'M', '9797', '1581', 'o', 'm', 'v', 'E']

Answer: 19092


Question: ['6019', '1467', '3415', '7785']

Answer: 18686


Question: ['3325', 'e', 'h', '3065', '695', 'D', '7645', '3747', 'h', 'H', '1811', 'd', '1337']

Answer:
21625