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: ['Q', '2271', '1803', '2363']

Output: 6437


Input: Consider Input: ['57', '9977', '2657', 'p', '9573', '7745', '4755', 'U']

Output: 34764


Input: Consider Input: ['3579', 'g', 'A', 'R', 'g', '5541']


Output: 9120