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: ['C', 'v', '1353', 'e', 'x', 'A', 'D', '1243', '477', 'z', '3483', '5213', 'k', 'm', 'n']

SOLUTION: 11769

PROBLEM: ['v', '4119', 'I', '475', 'd', 'L', '909', 'F', 'V', '775', 'k', 'A', '9411', '8383', 'W', '1521', 'z', 'j', '7057', 'I']

SOLUTION: 32650

PROBLEM: ['6791', '431', '3757', '71', '8661', 'b', 'w', '9463', '7361', '489', 'C', 'b', '4155', 'F', '5861']

SOLUTION:
47040