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', 'X', 'd', 'N', '1877', '2865', 'M', '1249', '9385', 'v', 'o', 'P', 'P', '6029']

SOLUTION: 21405

PROBLEM: ['211', '7561', '8725', '6139', 'I', '6585', '4231', 't', '2983', 'T', 'S', '9569', 'R', 'b', 'N', 'X', '9009']

SOLUTION: 55013

PROBLEM: ['W', '4659', '403', 'a', '1149', '8783', 'm', 'T', 'Q', 'n', '5231', '2759', '7119', '9569', 'i']

SOLUTION:
39672