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: ['u', 'e', 'P', 'D', '255', '2573', 'E', 'P', 's', '3725', '3391', 'I', '5323', '885']

SOLUTION: 16152

PROBLEM: ['6293', 'o']

SOLUTION: 6293

PROBLEM: ['t', '6649', '7685', 'l', 'C', '1317', '533', 'F', '379', '9627', '6165', '7013', 'X', 'N', 'W', 'p', 'x', '9693', 'z', '5557']

SOLUTION:
54618