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: ['Y', '9053', 'N', '6921']

Output: 15974


Input: Consider Input: ['E', 'v', 'l', 'c', 'g', '3929', 'q', 'j']

Output: 3929


Input: Consider Input: ['5257', 'v', '811', '7349', '7799', '1373', 'f', '8507', 's', '8053', 'Z', 'J', '8939']


Output: 48088