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: ['6055', 'v', '9455', 'A', '6817', 'D', '9339', 't', 'K', '1993']

SOLUTION: 33659

PROBLEM: ['h', '1157', 'm', '8975', '6165', '7491', '1855', '3489', '9629', '631', '9641']

SOLUTION: 49033

PROBLEM: ['R', '9751', '4367', 'l', 'N', '5125', '8751', '7507', 'y', 'K', '6127']

SOLUTION:
41628