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: ['q', '8155', 'L', 'v', '2657', 'X', 'v', '2353', '151', 'R', '967', '4327']

SOLUTION: 18610

PROBLEM: ['X', '989', 'U', '9551', '6385', 'Y', '1433', 'J', '1833', '685', 'u']

SOLUTION: 20876

PROBLEM: ['561', '8079', 'c', 'W', '1255', 'D', '4343']

SOLUTION:
14238