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: ['2577', 'B', '3059', 'S', 'l', 'T', 'Q', 'x', 'f', 'l', 'y']

SOLUTION: 5636

PROBLEM: ['M', '9933', '9861', 'f', 'N', 'R', '7625', 'p', 'T']

SOLUTION: 27419

PROBLEM: ['B', '4899', '8789', '9207', 'Y']

SOLUTION:
22895