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: ['251', '2155', '5029', 'k', 'j', 'I']

Output: 7435


Input: Consider Input: ['4601', '6021', '3005', 'I', 'f', '4631', 'Q', 'd', '8041', 'D', '8067', '7383', '757', 't', 'd', 'n', '2275', 'p', 'm', '6021']

Output: 50802


Input: Consider Input: ['N', 'W', 'T', 'y']


Output: 0