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: ['9403', 'u', '4159', 'w', '3467']

SOLUTION: 17029

PROBLEM: ['901', '1939', '7637', '8863', 'X', '5003', '8791', '4757', 'E', '1525', 'y', '9735']

SOLUTION: 49151

PROBLEM: ['v', '6213', '9037', '1707', '6213', 'm', 'A', 'b', 'f', 'c', 'Q', '4809', 'B', 'h']

SOLUTION:
27979