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: ['3051', 'Z', 'q', 'u', 'x', '2747', 'e', 'B', '4225', 'Q', 'R', '4629', 'F']

SOLUTION: 14652

PROBLEM: ['z', 'E', 'u', '4437', '7767']

SOLUTION: 12204

PROBLEM: ['9987', 'K', '4393', 'e', '9609', '7613', 'w', 'm', 'z']

SOLUTION:
31602