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', '4553']

SOLUTION: 4553

PROBLEM: ['5215', 'c', '839', 'V']

SOLUTION: 6054

PROBLEM: ['7713', '3427', 'f', 'G', '1767', 'm', '2285', 'U', 's', 'l', 'w', 'X', 'D', '7409']

SOLUTION:
22601