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: ['3013', '3955', 'f', '1183', '5111', '9509', '2351', '7087', 'f']

SOLUTION: 32209

PROBLEM: ['6121', 'S', '8683', 'Y', '6107', 'B', '6193', '5555', '365', '945', '1439', '7257', 'g']

SOLUTION: 42665

PROBLEM: ['5635', '177', 'e', 'B']

SOLUTION:
5812