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: ['3433', '6955', 'Q', 'E', '3557', 'S', '2931', '9879', 'S', 'f', 'Q']

Output: 26755

Input: Consider Input: ['8591', 'J', 'l', 'l', '7023', 'N', 'n']

Output: 15614

Input: Consider Input: ['r', '4375', 'O', 'f', 'u', '7005', 'f', 'm']
Output: 11380