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: ['7459', '491', '7823', '6965', 'H', '109', 'R', 't', '3959', '2821', 'R', '2807', 'o', 'v', '1305', 'a', '1411', 'r', '3669']

Answer: 38819


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

Answer: 31562


Question: ['A', '5773', '4015', 'D', 'z', '611', '7549', 'w', 'r', '7491', '2727', 'O', 'P', 'j', '4199', '8615', '1985', '3623']

Answer:
46588