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: ['2625', '1611', 'E', '4507', '3013', '1569', 'M', '2607', '1111', 'W']

SOLUTION: 17043

PROBLEM: ['2151', '7511']

SOLUTION: 9662

PROBLEM: ['s', '6813', '3421', '2227', 'C', 's']

SOLUTION:
12461