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.

Input: Consider Input: ['6921', 'a', 'U', '2821', '2111', 'h', '3937', '3697', 'd', '6309', 'q', '7961', '5287', '5375', '2721', '4523', 'V', '8633', 'c', '7643']

Output: 67939


Input: Consider Input: ['7067', 'E', 'C', '1879', 'Z', 'u', 't', '2053', '6769', 'r', '5207', '7009', 'H', '5587', 'i', 'M', '1357', 'A']

Output: 36928


Input: Consider Input: ['5295', 'B', 'S', 's', '7495', '1165', '6719', 'j', 'P', '669', 'Z', 'i', '8269', '2107', 'I', 'h']


Output: 31719