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: ['k', '6555', 'L', '7549', 'W', 'y', 'y', '8817', 'J', 't', 'X', 'M', 'N', 'G', '7441', '283']

SOLUTION: 30645

PROBLEM: ['4607', 'T', 'a', '6077', 'c', '4761']

SOLUTION: 15445

PROBLEM: ['Q', '4333', '4025', '2833', '9087', 'D', '7773', 'E', '55', 'V', 'f', 'a', 'l', 's', '3197', '9559', 'V', 'f', 'x', 'h']

SOLUTION:
40862