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: ['I', 'J', 'K', 'D', '5961']

Answer: 5961


Question: ['6051', '5303', '1509', '2797', 'Z', '4777', '721', '8563', 'K', '63', '9115', 'd', '7305', '9743', '7409']

Answer: 63356


Question: ['V', '3257', '7107', 'U', 'A', '7303', 'l', 'i', 'D', 'G', 'y', 'Z', 'u', 'e', '9019', 't', 'g']

Answer:
26686