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: ['3877', '2685', 'f', 'r', 'q', 'o', 'k', 'i', '2299', '9075', 'X', '4303', '7379', '9205', 'V', '9655', 's']

SOLUTION: 48478

PROBLEM: ['A', 'y', 'u', 'S']

SOLUTION: 0

PROBLEM: ['163', 'z', 'j', '3629', '4127', 'F', 'o', '7223', 'Y', '1171', '2781', '2725', '9583', 'u', 'K']

SOLUTION:
31402