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: ['K', 'p', '97', 'R', '2999', 'u', '7307', '6033', '6431', 'm', 'T']

SOLUTION: 22867

PROBLEM: ['b', 'D', 'b', 'X', '7971', '4749', 'T', 'S', '6701', 'y', 'Q', '9933', 'X', '7713', '3003', '9473', 'J', '7391', 'q', 'L']

SOLUTION:
56934