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', '9387', '7125', 'c', '1295', 'X', 'l', '9867']

SOLUTION: 27674

PROBLEM: ['k', 'a']

SOLUTION: 0

PROBLEM: ['3107', 'D', '9595', '8807', 'Q', 'o', 'T', 'N', 'A']

SOLUTION:
21509