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: ['F', 'z', '1159', '345']

SOLUTION: 1504

PROBLEM: ['q', '5151', 'R', '441']

SOLUTION: 5592

PROBLEM: ['5077', 'J', 'm', '7059', '9781', 'u', 'B', 'r', 'v', '95', 'p', '8573', 'c', 'd', '1671', 'z', 'e']

SOLUTION:
32256