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: ['D', '9679', 'e', '5537', 'G', 'l', '2653', 'a', 'Y', '8467', 'q', 'L', '7239', 'O']

SOLUTION: 33575

PROBLEM: ['X', 'f', 'p', 'R', 'N']

SOLUTION: 0

PROBLEM: ['4041', 'R', '3659', 'd', '5923', '3171', 'z', 'k', '9081', 'e', 'F', '8799', 'e']

SOLUTION:
34674