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: ['Y', '8169', '9067']

SOLUTION: 17236

PROBLEM: ['l', '2511', '2071', 'o', 'F', '7583', '1909', '1859', '3299', '3853', 'h', 'P', 'P', '9175', 'B', 'F']

SOLUTION: 32260

PROBLEM: ['N', 'c', 'M', 'X', '4279', 'e', 'M', 'Q', 'e']

SOLUTION:
4279