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: ['Q', '6383', 'P', '8455', '3881', '5821', 'e', 'v', '1421', 'Q', '6377', '3157', '6407', 'q']

SOLUTION: 41902

PROBLEM: ['6731', 'f', '4561', '5601', 'i']

SOLUTION: 16893

PROBLEM: ['o', 'X', '8427', 'u', 'Z', 'r', '7827', 'L', '4347', '1503', '5961', 'H', 'M', 'g', 'a', '6923', '8407', '4565']

SOLUTION:
47960