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: ['Q', '8317', '8989']

Answer: 17306


Question: ['3873', 'D', 'J', '2799', 'k', 'F', 'I', '3457', '5647', '4815', '7509', 'Y', '1251', '2211']

Answer: 31562


Question: ['5121', 'H', 'W', '5257', '6973', 'h', 'P', 'l', '8627', '3945', 'L', '4723', '2167', '9377']

Answer:
46190