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: ['r', 'b', 'G', 'H', '255', '6809', '5133', '1059', '4317', 'P', '7219', 'd', '805', 'G', '5243', '8305', '8509', 'o']

Output: 47654

Input: Consider Input: ['h', '2295', '2913', 'I', '5273', 'L', '2739', '8227', '6537', 'e', '6491', '5463', 'i', '4337', '537']

Output: 44812

Input: Consider Input: ['6255', '9981', 'x', '5427', '5135', 'c', 'q', 'u', '8067', 'z', 'I', '6485', '5399']
Output: 46749