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: ['7411', 'Y', 'x', 'l', '4119', '7241']

SOLUTION: 18771

PROBLEM: ['8871', '1297', 'W', 'f', 'Y', '8731', '113', '6707', '379', '9631', 'X', 'C', 'q']

SOLUTION: 35729

PROBLEM: ['J', '2045', 'K', 'c', '5195', 'o', '3133', 'p', '8959', '8641', 'v', '1949', 'R']

SOLUTION:
29922