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: ['8147', '3191']

Answer: 11338


Question: ['Q', 'v', 't', '223', 'm', 'l', 'c', 'M', 'b', '2227', 'P', 'e', 'n', 'f', 'S', '2205', '3517', '5545']

Answer: 13717


Question: ['7143', 'q', '9847', '9371', 'U', 'I', '2509', '5849', '3291', '2313', '9849', '6433', '6787', 'z']

Answer:
63392