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: ['e', '6633', '131', '7459', '3733']

SOLUTION: 17956

PROBLEM: ['t', 'v', 'B', 'Y']

SOLUTION: 0

PROBLEM: ['O', 'h', '1173', '4613']

SOLUTION:
5786