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: ['2765', '6767', '7645']

SOLUTION: 17177

PROBLEM: ['2485', 'Q', 'G', '5533', 'Y', '21', 'D', 'S']

SOLUTION: 8039

PROBLEM: ['I', 'B', 'm', 'k', '5009', '6285', '4389', 'p', 'x', 'p', 'W', 'X', '9897', '2981', '1967']

SOLUTION:
30528