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: ['x', '1887', 'E', '3995', '5677', '2749', '9951']

SOLUTION: 24259

PROBLEM: ['5289', '1701', '5925', '7973', 'F', 'V', 'y', '5903', 'i']

SOLUTION: 26791

PROBLEM: ['6355', 's', 'C', '5237', '211', 'H', 'r', '5521', 'D', '4629', 'K', '139', 'm', '6467']

SOLUTION:
28559