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

SOLUTION: 16893

PROBLEM: ['7187', '5651', 'd', '4869', 'q', '2375', '3547']

SOLUTION: 23629

PROBLEM: ['P', '8501', 'y', '9059', 'C', 'v', '3745', '5215', '7769', 'g', '7081', 'C', 'F']

SOLUTION:
41370