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: ['6731', 'f', '4561', '5601', 'i']

Output: 16893


Input: Consider Input: ['l', '2511', '2071', 'o', 'F', '7583', '1909', '1859', '3299', '3853', 'h', 'P', 'P', '9175', 'B', 'F']

Output: 32260


Input: Consider Input: ['6309', 'n', 'd', '4301', '2869', '7229', '7969']


Output: 28677