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: ['c', 'E', 'M', '1303', 'y', 'H']

SOLUTION: 1303

PROBLEM: ['D', 'R', 'Y', '4929', 'P', '7929']

SOLUTION: 12858

PROBLEM: ['o', 'q', 'u', '8031', '5755', '3843', 'k', 't', '3747', 'A', 'P', '8827', '6907', 'b']

SOLUTION:
37110