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: ['8739', 'K']

SOLUTION: 8739

PROBLEM: ['W', 'c', '7971', 'J', 'o']

SOLUTION: 7971

PROBLEM: ['6195', '2741', '2061', '1437', 'F', '6285', '5109', '6413', 'm']

SOLUTION:
30241