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: ['5331', 'f', '2865', '6019', 'U', 'm', 'g', 'n', 'Y', 'A']

SOLUTION: 14215

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

SOLUTION: 49151

PROBLEM: ['m', '1613', '8725', '3311', '3949', 'Y']

SOLUTION:
17598