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: ['M', '6989', 'I', 'w', '3591', '3067', '3883', 'C', '6049', '5723', 'j', '5989', 'C', 'R', '475', '7779', '671']

SOLUTION: 44216

PROBLEM: ['597', 'i', 'd', '3201', 'u', '1111', '8563', 'c', 'E', '5983', '6293']

SOLUTION: 25748

PROBLEM: ['6551', '4989', 'F', '9247', '605', '7931', 'S', 'S']

SOLUTION:
29323