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: ['c', '7415', '6253', '4477', 't', '9449', '7733', '2325', 'Z', '5413', 'q', 'm', 'R', '8619', '7289', '857', '7273', '7425']

SOLUTION: 74528

PROBLEM: ['w', '3085', '3553', '3599', 's', 'f', '6739', '259', '4259', 'S', 'f', 'l', 'k']

SOLUTION:
21494