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: ['191', 'R', 'Q', '7809', '4851', 'b', 'e', 'H', 'E', 'I', 'r', 'A', 'g', 'e', 'g', 'I', 'j', 'f', '7287']

Output: 20138


Input: Consider Input: ['s', 'g', 'Z', '8919', 'R']

Output: 8919


Input: Consider Input: ['6965', '8159', '5813', 't', '4341', '6711', '1293', '3621', 'C', 'd', '647', '9467', '4673']


Output: 51690