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: ['A', 'S', 'c', 'I', 'M', 'P', '8739', '879', '1401', '3941', '4061', 'q', 'P', '2805', '4473']

SOLUTION: 26299

PROBLEM: ['o', '7099', 'G', 'v', 'H', 'J', 'k', '1607', 'i', '9765', '2489', '8031']

SOLUTION: 28991

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

SOLUTION:
12858