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: ['5199', 'h', 'T', 'T', 'l', '1661', 'p']

SOLUTION: 6860

PROBLEM: ['R', 'k', '3355', 'Y', '6635', 'M', '4839', 'T', 'd', '495', 'g', 'E', 'g', 'F', 'S', '5377', 'g']

SOLUTION: 20701

PROBLEM: ['a', '9599', '8007', 'm', 'n', '2831', '4789', 'O', '367', '1683', 'D', 'q', 'i', 'T', '5619']

SOLUTION:
32895