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: ['2417', '6671']

Output: 9088


Input: Consider Input: ['l', 'B', 'Y', '7543', '5091', '1917']

Output: 14551


Input: Consider Input: ['R', '9003']


Output: 9003