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: ['2871', '1337', '3771', '4671', 'l', '3785', 'V', 'z', 'R', 'u', '6097', 'R', '4297', 'd', '6339', 'Y', 'V', '5873', '7399']

Output: 46440


Input: Consider Input: ['w', '2281', '8651', '2203', 'q', 'n', '4253']

Output: 17388


Input: Consider Input: ['R', '6621', '9061', '6377', '8139', '2199', '9073', '7501', 'U', 'e']


Output: 48971