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: ['8109', '5635', 'u', 'M', '1009']

SOLUTION: 14753

PROBLEM: ['T', '8333', 'C', 'Z', 'n', '1419', 'd', '3205', 'D', '1187', 'd']

SOLUTION: 14144

PROBLEM: ['6353', 'y', 'A', '731', 'E', 's', 'q', '6113', '8957', '7489', 'f', '5095']

SOLUTION:
34738