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: ['P', '237', 'X', '8893', '7931', 'F', '8359', 'S', '6931', '6953', 'r']

Output: 39304


Input: Consider Input: ['7335', '813', '6461', '8903', '3709', 'V', 'G', 'I', 'P', 'p', 's', 'v', 'R', '4697', '4263', '9897']

Output: 46078


Input: Consider Input: ['7061', '1417', 'd', 'L', '7435', '6281', 'z', 'P', 'c', 'b', 'q', '1587']


Output: 23781