TASK DEFINITION: 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.
PROBLEM: ['s', '9377', '3663', '1375', 'j', 'L', '7943', '1711', '7409', '9115', '1227', 'I', 'U']

SOLUTION: 41820

PROBLEM: ['m', '3481']

SOLUTION: 3481

PROBLEM: ['3369', 'X', 'G', '7137', 'm', 'a', '1819', 'H', 'c', 'L', '1847', 'o', '5879', '403', '2281', 'N', 'C', 'V', '9619', '6059']

SOLUTION:
38413