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.

['7459', '491', '7823', '6965', 'H', '109', 'R', 't', '3959', '2821', 'R', '2807', 'o', 'v', '1305', 'a', '1411', 'r', '3669']
38819

['Q', '6383', 'P', '8455', '3881', '5821', 'e', 'v', '1421', 'Q', '6377', '3157', '6407', 'q']
41902

['d', 'o', '8189', '3877', '9191', 'q', '1495', 'r', 'b', '459', 'b', 'i', '7701', '4907', 'r', 'R', '6317', '9085']

51221