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: ['A', 'S', 'c', 'I', 'M', 'P', '8739', '879', '1401', '3941', '4061', 'q', 'P', '2805', '4473']

SOLUTION: 26299

PROBLEM: ['W', '8593', '9427', '9931', '8919', 'X', 'B', '8861', '1933', 'Z', 'V', '3427', 'S', '8717', 'd', '1593', '7659', 'Q', 'n']

SOLUTION: 69060

PROBLEM: ['6033', '649', 'F', 'H', '3233', 'J', '5603', '403', 'C', '7503', '8187', 'r', 'F', 'A', 'B', 'w', '7727', '987', '4529']

SOLUTION:
44854